Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb169862fbc732a…

MALICIOUS

PDF

80.0 KB Created: 2021-04-28 21:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 56fe2f91bbad9bbe5351af96d5a6af97 SHA-1: 92d9751d330da3b01da682be41122cc01cd05882 SHA-256: 7fb169862fbc732a21cf664073756808ca184db7f940763fece5c9c64b557235
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded external links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/strik?utm_term=words+to+describe+a+forest+at+night In PDF document text
    • https://cdn.sqhk.co/medujebukoma/haDhdLw/61270389424.pdfIn PDF document text
    • https://fetesebi.weebly.com/uploads/1/3/4/8/134896421/nofinefojabemuxege.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/jadogelivafobefigud.pdfIn PDF document text
    • https://fafodedok.weebly.com/uploads/1/3/4/6/134602811/molefo_fawusu_nuzigovunitikib.pdfIn PDF document text
    • https://cdn.sqhk.co/romemanir/jfAZiic/you_had_me_from_hello_bon_jovi_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/az78ghB/amazeballs_cheese_woolworths.pdfIn PDF document text
    • https://cdn.sqhk.co/zanewijepex/jcbathb/zaxiboxaxoxosusunonod.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/chghQ5f/zijataronu.pdfIn PDF document text
    • https://nixabuvibowigev.weebly.com/uploads/1/3/4/3/134308208/punuwiriwekujibuxok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/714cd760-65ba-490a-a485-21759de546fa/char_broil_big_easy_turkey_rub_recipe.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_c36fa022404c4906bf3af0f0714330e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d3c0b31-6008-4e04-a5a8-f91001dece35/how_to_replace_a_transmission_range_sensor.pdfIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_126d43fe80c1411c8ac515c1019574ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd2f7f0-c0b2-4ee9-9acd-7b91aa678d1c/can_hp_officejet_pro_8600_scan_double_sided.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ffc586-3813-49b3-b135-cda8089bc456/kinoviwupum.pdfIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_ffdcd72e67b34d93918febbf09005fe1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7358d0f-4006-477c-b541-01019f2bd188/holmes_mini_tower_air_purifier_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad217329-ad1b-4ed6-9aca-5bf7df0f1e91/jajemibulivete.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_8328b29d67d94894a9c44ad9970696bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03a516a6-8087-4ac2-aeb2-b90d9f185dcf/how_to_train_yourself_to_become_a_spy.pdfIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_9576f2a8adc941d19b9152b397a35f39.pdf?index=trueIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_d77739aec2fb4bbd8127a207ae6a61fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52205d3c-8859-47df-9697-617ec8362390/42899645099.pdfIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_a51b3792c84d4d0e95a11ce8c0ca9e77.pdf?index=trueIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_1076a839979d4830afbaaffc4a18fb9a.pdf?index=trueIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_0e876469cffd460882126ef95228325e.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_e97bc066a71a4aef84ed539a37ee01dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/277becd7-43ec-472f-b06d-c0b35f2f5d8a/31638288523.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB8 5404 bytes
SHA-256: f344fbe47b06670675c3f06c51c64e0c70ac1ddbd9ddb695caf4d665e738f284
font_01_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 10960 bytes
SHA-256: 93e0b1e9bda9de4b163a7547f960e044041ff5f46315848333d6f02a0c8c9eab

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