Malicious PDF — malware analysis report

Static analysis result for SHA-256 5629dea573e8ea0c…

MALICIOUS

PDF

75.5 KB Created: 2021-05-31 06:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9b1703ea7a6eb6b1078d2894d265f828 SHA-1: 68794ec6b7e9b28f7152e01955817af0644d1aad SHA-256: 5629dea573e8ea0cb0f2df9874071118ceb81ccdea3b9efcd8670238ef1b5324
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The document's content, disguised as a guide on writing semi-formal letters, is likely a lure to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=how+to+write+a+semi-formal+letter PDF link annotation
    • https://nirixebuwema.weebly.com/uploads/1/3/5/9/135990662/lisixepajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412773/normal_5fe909c0b7d4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366048/normal_5fcbc1470b936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420907/normal_606dfe7fcdaf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_604b0830e3dee.pdfIn PDF document text
    • https://warubeduzubam.weebly.com/uploads/1/3/5/2/135298611/deac7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405950/normal_604387cf61019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496616/normal_6039ee7564689.pdfIn PDF document text
    • https://pekamolotoli.weebly.com/uploads/1/3/4/6/134696990/vufamuxezu_jafelixe_denelu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393033/normal_5ffffcb02d58c.pdfIn PDF document text
    • https://lupofavegevo.weebly.com/uploads/1/3/5/3/135335207/6681766.pdfIn PDF document text
    • https://kunatelifarak.weebly.com/uploads/1/3/2/7/132712072/8708360.pdfIn PDF document text
    • https://daxozeke.weebly.com/uploads/1/3/4/3/134322415/2e0eba8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450512/normal_5fd3956185f63.pdfIn PDF document text
    • https://mexobuvuxe.weebly.com/uploads/1/3/4/3/134369937/medasawesor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_6020f97c60b49.pdfIn PDF document text
    • https://fegeletori.weebly.com/uploads/1/3/5/9/135964279/c8b64.pdfIn PDF document text
    • https://raguloduw.weebly.com/uploads/1/3/4/0/134041620/cabd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394060/normal_5fe5a0a1518df.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/tiliruk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 5000 bytes
SHA-256: 0ec13371c456f7e128a26f4b9b78b6f554fff932217790e949a3b6ff19c0799f
font_01_sfnt_off0000fc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC23 10624 bytes
SHA-256: 5d0faf21732e2e1b9de4a5fcf041dda8e7109098dae80543368c9d20a6af6097

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