Malicious PDF — malware analysis report

Static analysis result for SHA-256 991fb36cb3a7f574…

MALICIOUS

PDF

78.2 KB Created: 2021-03-18 01:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b62052209c05463d3a1fb5db562fa18 SHA-1: 2cc8abe2eadb86a0e40e83dfe245ae515b2ca70c SHA-256: 991fb36cb3a7f574b730e7324b86a1ddc4887d5522338215c671b19f8ade9baf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL, 'https://mezovuduw.ru/award?keyword=system+for+ophthalmic+dispensing+pdf+free', suggests a phishing attempt disguised as a free resource. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=system+for+ophthalmic+dispensing+pdf+free
    • http://xofebuledat.scienceontheweb.net/senior_interior_designer_jobs_nyc.pdf
    • https://nozabuzewetuk.weebly.com/uploads/1/3/2/6/132683147/desipujekade-tajexerefobem-wepokijinujen.pdf
    • http://kerutugizuxig.mygamesonline.org/attack_on_titan_season_3_part_1_ending.pdf
    • http://junumidutuzakox.getenjoyment.net/physical_examination_health_assessment.pdf
    • https://cdn.sqhk.co/pinofizulag/Fhd9Nhe/55603682695.pdf
    • https://cdn.sqhk.co/vipujitebiki/fTBUTjb/wedding_dress_upcycle.pdf
    • http://kirudikegopoded.sportsontheweb.net/java_gui_programming_download.pdf
    • http://bumosid.getenjoyment.net/2333793256.pdf
    • http://buvalopexur.mygamesonline.org/birmingham_barons_schedule.pdf
    • https://kijatuvoriwoze.weebly.com/uploads/1/3/4/3/134352029/gixisel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_81d1310d7b5a445c926d6f1ac4b04543.pdf?index=true
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_428a5c2a133e4142bdb0c9ac632bbc9d.pdf?index=true
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_0f8c04e86d7c4056a22a9e74697aa059.pdf?index=true
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_ac5c8cd3868d4bd9890c4df73bc8d9ad.pdf?index=true
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_4b0fa7f17abc40e4baab6c1fb91a9128.pdf?index=true
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_a1c05df7e5684cd1813d5a49a4b392a0.pdf?index=true
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_e69484b4f1164fc6931d361d42317c62.pdf?index=true
    • http://legokejapo.atwebpages.com/swear_words_in_arabic_to_english.pdf
    • http://kikanelomer.onlinewebshop.net/negumafoxazuwaweb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e651.bin
dc37ef49f594d85e51872eabdd5aff51652e664ecb8b56df814d84960299a5ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 5564 bytes
font_01_sfnt_off0000f90f.bin
fdb28c60ef64ad6736818e9579646b0f5c8ffc8de2969f3d743baf67c36b913e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 10640 bytes
font_02_sfnt_off00011d81.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D81 4324 bytes

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