Malicious PDF — malware analysis report

Static analysis result for SHA-256 866f42aefd3d46c6…

MALICIOUS

PDF

86.7 KB Created: 2021-03-30 14:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5dc75bbd7c0f6a11087df59a7cfbb811 SHA-1: 19ec1304f12f9935994209c7180ef810aaebb2eb SHA-256: 866f42aefd3d46c61c26a93c9878b6676ca4d00d82283e572569954a14e6452d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://maypoin.ru/strik?utm_term=historia+do+dinheiro+real+no+brasil PDF link annotation
    • http://reduslim-ufficialesito.site/55785974278s2k3.pdfIn PDF document text
    • https://cdn.sqhk.co/kobamebexog/hjihjRZ/ekko_guide_jungle_s8.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/b4idhhy/battery_day_time_est.pdfIn PDF document text
    • http://nosinoski.shop/does_a_washer_dryer_combo_have_a_lint_trap4o3qa.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/givelexifawiweveg.pdfIn PDF document text
    • http://lavkavkusa.store/36333222556xxb3.pdfIn PDF document text
    • http://haifaiv.ru/era_of_warring_states_japan3mmm0.pdfIn PDF document text
    • http://raisinshub.pro/save_website_as_chromeui2lf.pdfIn PDF document text
    • https://kavosimodo.weebly.com/uploads/1/3/4/9/134901779/zefibiz-zujirarovujoz.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/haL7Q1m/22929061390.pdfIn PDF document text
    • http://kakerusejom.iblogger.org/61562057277.pdfIn PDF document text
    • https://cdn.sqhk.co/vivejegefonu/5iagj6u/76102559259.pdfIn PDF document text
    • https://vedexojofidas.weebly.com/uploads/1/3/4/5/134581268/sirasagukawo-natedadudif.pdfIn PDF document text
    • https://cdn.sqhk.co/gabamulijawe/Aihghja/online_games_with_friends_free_zoom.pdfIn PDF document text
    • https://tolubezilonis.weebly.com/uploads/1/3/5/3/135348590/cc84962b62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_785c516ab54f40629a2046e2c013952b.pdf?index=trueIn PDF document text
    • http://xirotowukutizu.epizy.com/energy_fluctuation_in_canonical_ensemble.pdfIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_60c142f86e8244bab3d273dcddf2eb48.pdf?index=trueIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_02810c59e0504b56ae461e79ee320c14.pdf?index=trueIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_bd2ee8464df4441b94b9b70b6e53b946.pdf?index=trueIn PDF document text
    • http://wipapirub.epizy.com/teeth_arrangement_in_complete_dentures.pdfIn PDF document text
    • http://kipetitumi.rf.gd/99921590718.pdfIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_07570801179d480580587edc6f234796.pdf?index=trueIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_945c976aff0f4b54ae2d9c3d87f80b1a.pdf?index=trueIn PDF document text
    • http://sugazaxarul.epizy.com/16personalities_premium_review.pdfIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_88a8305cc3644d28801423fc21f52150.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 5012 bytes
SHA-256: 7e518ef08d71c8f6246da2193b258d554b58ee9283bef10e55c9c3f16de0d7e2
font_01_sfnt_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 13036 bytes
SHA-256: 2efc75928ac2404f0b172cb962b43c58236dac76eb13386a745292498e9cf079
font_02_sfnt_off00013560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13560 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e