Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb12fc554b379479…

MALICIOUS

PDF

75.0 KB Created: 2020-12-19 12:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e9fd17b5c2b117eacaf9fd428c9bd687 SHA-1: 7ad9721906dc7f4cca1fab766dff5e2b70399af6 SHA-256: cb12fc554b3794797a8198e328426a113af053e785722eb2db1c288cc38715ed
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains like weebly.com, suggesting a link farm or phishing campaign. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a deliberate attempt to direct users to potentially malicious or spam-related content. The ML classifier and ClamAV detection further support its malicious nature.

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://trafffe.ru/aws?utm_term=eleanor+oliphant+book+club+questions+and+answers PDF link annotation
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/7933852.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465015/normal_5fc8837319a31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500677/normal_5fb60ce8bbb5a.pdfIn PDF document text
    • https://kukatuvitakutir.weebly.com/uploads/1/3/4/6/134690336/fegebo.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/faxuvowuzamis-fepupaluw-wijok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419822/normal_5fb273e48f7c5.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/9381ec662c75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f8731997fd5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f9ca1abdfc43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490123/normal_5fb70fa56cb3a.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/muxozuvalubi/67277878861.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdee119b1ed035389f4152/1606282770285/jezogomadegenoxiv.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/cg_police_vacancy_2018_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd00162edfcd2bda91dba9/1606221846374/kajige.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_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 5540 bytes
SHA-256: 8619006eead20051c4605922e7b2e45f28f5acbd1e74dc798548e2078e780773
font_01_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 10604 bytes
SHA-256: 7172716cf605b5c5ce236243a7931d7ba5ef4ffc4ebff96a6628d96c4f48356a

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