Malicious PDF — malware analysis report

Static analysis result for SHA-256 376039ed6474af77…

MALICIOUS

PDF

74.1 KB Created: 2021-05-30 09:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8204b5e12af128a5ee2c3102feb47e1b SHA-1: f808a2c45f9db06a8a1d0edf408e37e55111b7fb SHA-256: 376039ed6474af774d5dd100cbf1c737f795cbee659603058ef7086efccedeb8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/123?utm_term=multinomial+logistic+regression+in+r+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421624/normal_604b18f9740a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450730/normal_6043974e131a4.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4372383/normal_60b03bf713e88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_6020fb302ab46.pdfIn PDF document text
    • https://wefikugozakilo.weebly.com/uploads/1/3/1/0/131069992/tawumobuvabojif-nifumabiw-jaxivuditeke.pdfIn PDF document text
    • https://wojaxesisitofem.weebly.com/uploads/1/3/4/7/134717171/razanefutevuw.pdfIn PDF document text
    • https://tedetoxemerul.weebly.com/uploads/1/3/5/3/135311624/7badfec5b3c20af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_5fd0f379019d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392463/normal_6052b07fe48c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495691/normal_5fefff8310ec9.pdfIn PDF document text
    • https://voxiranadazezud.weebly.com/uploads/1/3/5/3/135312978/guwimijobej-devaw-luger-kowira.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_600c774b00e10.pdfIn PDF document text
    • https://kisofoga.weebly.com/uploads/1/3/1/3/131383553/pebebetuteji_tipeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383567/normal_5fdacb31b7b41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375708/normal_5fc74fe05e755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500183/normal_6039450e16961.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/labutipolu.pdfIn PDF document text
    • https://luketekovagitor.weebly.com/uploads/1/3/4/2/134236109/polaluxutin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409393/normal_60016c271b263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413111/normal_60232ebe121c6.pdfIn PDF document text
    • https://dodezugufiz.weebly.com/uploads/1/3/5/3/135331092/33f473d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411701/normal_60599f9112284.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_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 5480 bytes
SHA-256: 70d58148f01ca3578414d05a05654fe7091404d7622ff1805f9e8aeb58111d28
font_01_sfnt_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 12404 bytes
SHA-256: 1b9ceaf40e3f8d973db9987c96dd04d51c65cd6449e3f358bf85b9e40589bdd4

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