Malicious PDF — malware analysis report

Static analysis result for SHA-256 eefc1d7e3fd0d67c…

MALICIOUS

PDF

77.6 KB Created: 2021-06-11 03:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c23834fa69fbc5ef37d78ccaf56b0b59 SHA-1: 045ff4db009f7e9558b302c978d07f5a87898788 SHA-256: eefc1d7e3fd0d67c3427305efb1fd730b7d2ca3540a3daade01e9eed713d306b
226 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, indicated by the presence of numerous external links to disposable hosting sites, many of which are likely part of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent. The document's content, though heavily obfuscated, appears to be a lure for a software download or update, potentially to bypass gateway security by requiring a password for an archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pistant.ru/pbw?utm_term=chew+wga+v0+9 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376096/normal_603b74bdde25c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454161/normal_5fff97aca4877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471682/normal_60265e9dd669c.pdfIn PDF document text
    • https://vasaradafivoza.weebly.com/uploads/1/3/6/0/136048391/29b579a68d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_60bffbda84ffe.pdfIn PDF document text
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/8320730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_6060b54741c47.pdfIn PDF document text
    • https://gomigara.weebly.com/uploads/1/3/4/7/134727279/kazezisi.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/bemasetenam_durefik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_600ae81ae14df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_601b43398ecef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456121/normal_601ec49387ff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417314/normal_600ade536ec8c.pdfIn PDF document text
    • https://legonetu.weebly.com/uploads/1/3/4/5/134585206/8961627.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/8046684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457302/normal_5fcd33f905f49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415331/normal_5fd8842ec60f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_5fea07c6d00e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5ff683766653a.pdfIn PDF document text
    • https://musibagufes.weebly.com/uploads/1/3/4/5/134587398/fomiwoxitido-sijusawesivozek-wetuwenuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_606dc602f0a14.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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 4556 bytes
SHA-256: c206425bd3895572de59f8656d804a8a21bee67454b57ab49177497d208596b7
font_01_sfnt_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 21856 bytes
SHA-256: 05cd767efdb00ea0675808e1b759e5fae655ff473f159235cf701b291dbf981a
font_02_sfnt_off000119c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f