Malicious PDF — malware analysis report

Static analysis result for SHA-256 66229f50fa0af45e…

MALICIOUS

PDF

89.9 KB Created: 2021-01-10 21:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 31693b44678d44439606430148e59b6e SHA-1: 7290e3471a11e0e9a84c3961a561f974ac97fd66 SHA-256: 66229f50fa0af45e9461ef1ae8e5321a2a805f48c3e9f615342db02bcf4c561b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to various disposable domains, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a link farm on disposable hosting reinforces this assessment. No scripts were extracted, but the primary attack pattern involves directing users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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/123?utm_term=deschutes+county+assessor+dial PDF link annotation
    • https://kivisibef.weebly.com/uploads/1/3/0/7/130775328/lagibanagepozul-dodewix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392191/normal_5fe98d4cd5901.pdfIn PDF document text
    • https://mofalapew.weebly.com/uploads/1/3/4/3/134307760/9138027.pdfIn PDF document text
    • https://sumigixutaruxaj.weebly.com/uploads/1/3/4/7/134748626/6526926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5fb01123d0d2d.pdfIn PDF document text
    • https://fixesotufo.weebly.com/uploads/1/3/4/6/134681436/juvoribimuvus.pdfIn PDF document text
    • https://vijujaluju.weebly.com/uploads/1/3/2/7/132741375/6932432.pdfIn PDF document text
    • https://legadiduzavof.weebly.com/uploads/1/3/2/6/132681829/nusepige.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/bupaxomu/veg_biryani_recipe_in_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/31550420992.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/5796588131.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_off00011f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 5128 bytes
SHA-256: 71df2d42731b435a417354be933771dddb40b937cda9adb287a7d8bd2411583a
font_01_sfnt_off000130be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BE 12016 bytes
SHA-256: 31e5bdb13442aa6be23ecce51a684e77dc2e3ad0ed523dc78768e5dad8608357

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