Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51561051184b436…

MALICIOUS

PDF

83.7 KB Created: 2021-03-07 01:52:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3ffac313ac54455a8b69f57105d55a18 SHA-1: 5587d049d6f732edd92e5093982cc6f1969d52a1 SHA-256: d51561051184b4369e8e9c7d73e9d89d642c7682580d0994ef0a009d61961182
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=what+do+triage+nurse+mean PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451039/normal_60353e7aed689.pdfIn PDF document text
    • http://pukazabix.22web.org/clash_royale_deck_guide_arena_4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_603d9a01a9ac5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375083/normal_5ffa15a963217.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/kufel.pdfIn PDF document text
    • https://verigidiloje.weebly.com/uploads/1/3/0/8/130874422/xuwadozu.pdfIn PDF document text
    • https://daxeteven.weebly.com/uploads/1/3/2/8/132814811/wuxepomolex_sologobifisitij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416669/normal_603b215f37ccf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402712/normal_5fe5db1c6d9a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376087/normal_5fe9c92564b2f.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/gorajikunobixi/vanilla_javascript_submit_form_ajax.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/93891852696.pdfIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_0b813c981d2d44588ef6ca9a709168c2.pdf?index=trueIn PDF document text
    • http://xaxotuk.epizy.com/jipobunofa.pdfIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_2df9aa594471440f9fc33f2e91ed425d.pdf?index=trueIn PDF document text
    • http://luwawabegopit.rf.gd/93615159952.pdfIn PDF document text
    • http://selifesupenikiv.epizy.com/63467412774.pdfIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_94e8a9b158c54f588b03b8f7d7a21fa7.pdf?index=trueIn PDF document text
    • http://mewexudidis.epizy.com/kedikalovakukosegiragu.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_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 5220 bytes
SHA-256: 24dc94e52e35225ec7df7c7eb374c474fa83a24276ed4b8de72ec6c86aa48fab
font_01_sfnt_off00011827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11827 12632 bytes
SHA-256: f0d236464d615dff7ec5670a64d443c04468fd8eff38d19514e9a7b4817ac0f1

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