Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea7c581f668f36a…

MALICIOUS

PDF

126.4 KB Created: 2021-06-01 02:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e21eea5e4e3dffcf03715fcee62a750 SHA-1: d6a529d292c89d2fc45c7eb153360b1e2fdf33c6 SHA-256: bea7c581f668f36a84be22076ebcb063e4422a3273d07fe49d4a1515c82fab9b
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, and is detected by ClamAV as Pdf.Phishing.Trojan. It functions as a link farm, containing numerous external links to other PDF files hosted on various domains, some of which are disposable. The primary purpose appears to be SEO manipulation or the distribution of further malicious content through these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://fokemale.ru/123?utm_term=meaning+of+uniformly+accelerated+linear+motion
    • https://rupibofog.weebly.com/uploads/1/3/1/6/131607232/winobos.pdf
    • https://static.s123-cdn-static.com/uploads/4415061/normal_5fca68633cdff.pdf
    • https://tisitijalazog.weebly.com/uploads/1/3/6/0/136017937/a11ea67e.pdf
    • https://nazugawexavidi.weebly.com/uploads/1/3/4/6/134678572/80cc4169.pdf
    • https://cdn-cms.f-static.net/uploads/4406482/normal_6059944a5a086.pdf
    • https://static.s123-cdn-static.com/uploads/4496580/normal_5ff0a2ea8ee90.pdf
    • https://cdn-cms.f-static.net/uploads/4382793/normal_60481d6d54b63.pdf
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/wotoverutofom_siwizofarapado_nusipomusoke_tijerobanuderaw.pdf
    • https://runufegoxow.weebly.com/uploads/1/3/5/3/135347372/1768115.pdf
    • https://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/xesonolelisuw-katumotekobekiw-zasekigalidipu.pdf
    • https://mujoganik.weebly.com/uploads/1/3/0/7/130776873/bopepigozid-vejifanamo-galakutalirif-liloxek.pdf
    • https://dakubotamijez.weebly.com/uploads/1/3/2/7/132712147/731897efec26356.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wejojixi.pbworks.com/f/71361374765.pdf
    • http://taxexuwej.pbworks.com/f/29683738581.pdf
    • https://uploads.strikinglycdn.com/files/dd2ae376-9c11-4335-9163-f58a5ddf3b57/bamogesanebaduzizemuru.pdf
    • http://degenazi.pbworks.com/w/file/fetch/144433209/nemezoferidodusumez.pdf
    • https://uploads.strikinglycdn.com/files/df353663-9c2a-4301-a109-e5f60b89177c/tefonegipovu.pdf
    • http://jesababa.pbworks.com/w/file/fetch/144414729/types_of_register_in_english_language.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000190b0.bin
57173a72ea6bca2727219675c1e5445b87800176e3f04e4311795f0cbc02c64d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x190B0 5268 bytes
font_01_sfnt_off0001a2a1.bin
ff769e4bd61c66f759bf110a6262167a7f1e69f5b6f263cf16f88288fc3a204b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2A1 14676 bytes
font_02_sfnt_off0001d3ab.bin
483015172d5b8d3b35d86fe91a9a7f4ea92b1c0a54fe06e33c39912db148df48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3AB 16352 bytes

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