Malicious PDF — malware analysis report

Static analysis result for SHA-256 7677a60294acfb71…

MALICIOUS

PDF

79.0 KB Created: 2021-03-22 12:02:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 91045508960f5f93ff79660e65f462fd SHA-1: 9f06f552610e9acdd045679932c6221ffad5865d SHA-256: 7677a60294acfb7151e95194e2e40640a7ae62521b2b5cbc034bfa92b6e82644
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's likely a phishing or scam document. It contains a large number of embedded links, with one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a theme of 'how to fix a computer problem', likely a lure to encourage clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=how+to+fix+a+computer+problem In PDF document text
    • https://cdn.sqhk.co/xamozafi/giqBJha/wakigigivomevedupugabu.pdfIn PDF document text
    • https://cdn.sqhk.co/pidikuso/eggBzYf/kefezeturero.pdfIn PDF document text
    • https://cdn.sqhk.co/desixurate/Lfjcrjc/vofufovidiwobikuluvif.pdfIn PDF document text
    • https://cdn.sqhk.co/faresawuf/ejbhitf/chocolate_mousse_recipe_no_eggs_cocoa_powder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_601cec5eb2c56.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/ibgigsh/jiffy_lube_oil_change_time.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/eoTqgcq/smart_update_manager_8._4._5_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/cTsmXhb/21136662657.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411218/normal_5ff8ec97956aa.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/zQhahiF/monster_defence_king_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449774/normal_6034f423e38d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/aarariraro_siruthai_song_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/anheuser_busch_inbev_nv_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/62015410987.pdfIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_c6b976a2eefe4ad8b122004b3ac781f6.pdf?index=trueIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_411da62a62a1410da11a6bf17263a7ee.pdf?index=trueIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_4f70a0aef388462faa5c58beb5ff34c5.pdf?index=trueIn PDF document text
    • https://a1bd7baf-2de3-4c81-8914-4b74a732ecf9.filesusr.com/ugd/c89f15_4522793d3f294c4e9460aace34bffc23.pdf?index=trueIn PDF document text
    • https://c207dc97-0cc9-441e-8caf-a702c1639d46.filesusr.com/ugd/36abe8_40e131db376e4cb09e16fc921090b68c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/deductive_vs_inductive_worksheet.pdfIn PDF document text
    • https://5da1c7d8-01c4-4175-bbf8-c25915566394.filesusr.com/ugd/1084fb_7999e0164ea0498e9f2ed6059b2b2f63.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fikuvine/vipafidage.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_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 5244 bytes
SHA-256: e7464a88d80cb2ddfb428688c236534092f7425de148fbcd752669a3b4e274f6
font_01_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 11076 bytes
SHA-256: f4341670f7ed8505e2488f32bc537cdcf4f4de600c5728bb36aa0afdeeef8bfd

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