Malicious PDF — malware analysis report

Static analysis result for SHA-256 73293d4d91968f82…

MALICIOUS

PDF

71.2 KB Created: 2021-04-29 11:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 923985cfa5d3d0c393c77771d5eb87b1 SHA-1: 277fbab27d86feec5c46c2bfdbaa7fad24a28eaa SHA-256: 73293d4d91968f8272a512ebaf3b7be8004bce43225023bc67f2c8dcd4c7406f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, suggesting a link farm or redirection mechanism. The primary malicious URL identified is https://jottigo.ru/strik, which is likely used to serve a second-stage payload or phishing content. The document body, though heavily obfuscated, contains text related to a book title, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=tom+clancy+the+division+book+dark+winter PDF link annotation
    • https://cdn.sqhk.co/wisisatofife/ZieggdO/crystal_reports_8._5_free.pdfIn PDF document text
    • https://xovifare.weebly.com/uploads/1/3/4/5/134524114/kudizovasivon-sevasoj.pdfIn PDF document text
    • https://fowemofuf.weebly.com/uploads/1/3/1/3/131379389/buzututamolexarowe.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/hengggj/stormfall_saga_of_survival_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/qhbiipl/hidden_escape_lost_temple_walkthrough_chapter_7.pdfIn PDF document text
    • https://falufanimuv.weebly.com/uploads/1/3/4/3/134377488/e2e426bb4f.pdfIn PDF document text
    • https://lutigasudubuwa.weebly.com/uploads/1/3/2/6/132695203/8708532.pdfIn PDF document text
    • https://cdn.sqhk.co/gasalikuviz/UjghGih/cabins_near_snow_trails_mansfield_ohio.pdfIn PDF document text
    • https://jurusaxigudovof.weebly.com/uploads/1/3/4/3/134341302/dodupoxu.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/7ce323c2af7a41e.pdfIn PDF document text
    • https://susominen.weebly.com/uploads/1/3/4/7/134714937/dojogesube-tigit.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/tabobujimo/black_satin_cowl_neck_dress_missguided.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/stihl_weed_eater_line_change.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/eenadu_epaper_online_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e8df53c-7472-4fa4-ad3a-ca9d7aaab002/77605967955.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/gafatawerebotatunotaruma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622a2cd5-a355-4d82-98b7-10522f0dd374/nuvilidib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d42ad29-cef9-4ec8-87f1-beba19eef7c9/c_cookbook_oreilly.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_off0000d6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E7 5584 bytes
SHA-256: 139cd49116bbfe2a11106bc63be206e28140f4a2a18e3f53de290a5e6e69dc80
font_01_sfnt_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 10820 bytes
SHA-256: 8b8b687da76cd95ce02adc53d3c1bf0c69489f4a2b919280f6ef128832d45bef

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