Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b53593bb26a325f…

MALICIOUS

PDF

78.2 KB Created: 2021-04-04 11:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f844c217cd90943af904f3666ad21e9c SHA-1: 9da0320b721e4309806a5ef313fa2ade123a19d9 SHA-256: 7b53593bb26a325fcae2941cec4e37fdddcfd7cfd56152ce1ddd6d9084ea9710
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=angry+video+game+nerd+adventures PDF link annotation
    • https://gatepeduvemixif.weebly.com/uploads/1/3/4/6/134669895/kifenotu.pdfIn PDF document text
    • https://bosesupipi.weebly.com/uploads/1/3/4/8/134899809/bozogasi.pdfIn PDF document text
    • http://construt.site/bd_passport_application_formnekqf.pdfIn PDF document text
    • http://cardioactiveuficiale.site/4526184930jo9j1.pdfIn PDF document text
    • http://teenagetutor.online/1469143714e9ppz.pdfIn PDF document text
    • http://community-day.ru/best_cracked_apk_store496bw.pdfIn PDF document text
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/pulakutexigubo-xowasugesez-kuxoxawakakol-xofamumigabuk.pdfIn PDF document text
    • http://sluzhba1.net/84667037774sq6va.pdfIn PDF document text
    • https://dujizajep.weebly.com/uploads/1/3/4/7/134704211/6762447.pdfIn PDF document text
    • https://waguxezemi.weebly.com/uploads/1/3/4/7/134703223/f0b823e856ac2e.pdfIn PDF document text
    • http://effektzhizni.ru/xejadesimuxifid47t0.pdfIn PDF document text
    • http://goproonly.com/698492468129mduq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1396e6d6-69bd-4ea2-b440-1105239b75f0/gusirizosamipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb78af3-583d-4aa8-82ae-9ba3a9be8126/how_to_fix_a_leaking_mixer_tap_at_the_base.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afbe5b24-1762-477b-b550-c65cf1ab240a/organizational_structure_chart_template_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/406942cc-8ee2-42ab-813b-e56d4d9bf6b6/dawizasekanedezenu.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/tanejaxifikagopixinoteni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4575ac9c-9917-4c23-a436-648335cf82a5/jejinipojanixugedozeruwa.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/the_innovators_solution_clayton_christensen.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/67984412594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa2aa42-cd03-47d4-907a-c7fc195b7e5c/91183015706.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/wanomeninamatotutepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e94210c-c696-4c1f-8e8e-20389ee0e963/blue_bossa_real_book.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_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 5264 bytes
SHA-256: 0b82a2b40684df47f9943e0ac9851507e7c3ca06a2dc815572f17019c019fdbd
font_01_sfnt_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 10776 bytes
SHA-256: 3b28aeef37f89a215ac050073c83dfb304e50426a1d31fdee557c782c4bb2978