Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81ae7065f9b6661…

MALICIOUS

PDF

74.0 KB Created: 2021-06-08 17:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2ce41fd9fb5ee4ede77e7c225904aa66 SHA-1: 5534b23126cf0a51165a163e0927783eaf353328 SHA-256: e81ae7065f9b6661ddda5caa22808879169a2028e4fa1f825a24c4074a677a2e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDF files hosted on various domains, suggesting a tactic to manipulate search engine results or distribute further malicious content. The presence of multiple external links and the nature of the detected heuristics strongly point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/pbw?utm_term=shirdi+wale+sai+baba+aaya+hu+tere+dar+pe PDF link annotation
    • https://puzerufatuv.weebly.com/uploads/1/3/1/1/131163838/6038906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481168/normal_6009ce507a528.pdfIn PDF document text
    • https://raketesi.weebly.com/uploads/1/3/4/6/134632322/2212104.pdfIn PDF document text
    • https://zekisotirateme.weebly.com/uploads/1/3/4/3/134368555/7e023e1681f0942.pdfIn PDF document text
    • https://kigolaris.weebly.com/uploads/1/3/1/3/131380971/88c8c11465704a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_605501ced84ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486367/normal_5fc7c4a442db8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367279/normal_6008605056760.pdfIn PDF document text
    • https://xukokamil.weebly.com/uploads/1/3/4/3/134317204/1962305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461761/normal_606c0d35d12eb.pdfIn PDF document text
    • https://porepegozid.weebly.com/uploads/1/3/6/0/136050151/mapebojudi_fajumaxuteg_logav_wurenubuzanerif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://jajafad.pbworks.com/f/3669984232.pdfIn PDF document text
    • http://rixepal.pbworks.com/w/file/fetch/144635739/cubase_8_activation_code_keygen.pdfIn PDF document text
    • http://popuwepux.pbworks.com/f/95732595058.pdfIn PDF document text
    • http://jivevisubido.pbworks.com/f/cinema_4d_free_trial_windows_8.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/how_to_start_a_logistics_company_in_south_africa.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/f/9488669484.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144791289/98257699185.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9F 5148 bytes
SHA-256: 06eca7a67aaffa3e16255f44a28dd4905314f89dc5e4722c08bd238de8734077
font_01_sfnt_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 9960 bytes
SHA-256: 3c8164c3f931b38900ba0c4fc6320be7aad57c8daafb9c3dddff2215323a4eab
font_02_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_03_sfnt_off00010fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEC 2488 bytes
SHA-256: 63fd7caef7b68a7ea84e2c76f471c295dc7a4bffc20014f0417529a54e412f71