Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37979e176aa53ab…

MALICIOUS

PDF

78.3 KB Created: 2021-05-20 17:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bc65481c411806f831621bb2a900b89 SHA-1: b89aef2b2cab7093d8500ef912363dd450421756 SHA-256: a37979e176aa53ab127809fea8a1ce02490eb8c8b01339af8bd5edbeb90b7bfc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for SEO poisoning or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=fundamentals+of+project+management+slideshare
    • https://denelabi.weebly.com/uploads/1/3/4/1/134109088/dikaz.pdf
    • https://static.s123-cdn-static.com/uploads/4501229/normal_5fcd099578a99.pdf
    • https://cdn-cms.f-static.net/uploads/4450721/normal_6041623f7779d.pdf
    • https://static.s123-cdn-static.com/uploads/4476750/normal_5fcee5b0b520c.pdf
    • https://cdn-cms.f-static.net/uploads/4451047/normal_60595b9a08c1b.pdf
    • https://cdn-cms.f-static.net/uploads/4392215/normal_60653c38306fd.pdf
    • https://static.s123-cdn-static.com/uploads/4450041/normal_5ff027459c332.pdf
    • https://static.s123-cdn-static.com/uploads/4448357/normal_5ff6a82333b45.pdf
    • https://static.s123-cdn-static.com/uploads/4491686/normal_5ff57d6578272.pdf
    • https://cdn-cms.f-static.net/uploads/4382639/normal_6069e8847ee43.pdf
    • https://static.s123-cdn-static.com/uploads/4418369/normal_5fcc61678060e.pdf
    • https://cdn-cms.f-static.net/uploads/4427499/normal_60485091c2a17.pdf
    • https://liwigudujonaj.weebly.com/uploads/1/3/5/3/135383521/5405478.pdf
    • https://cdn-cms.f-static.net/uploads/4495843/normal_6031bc5673eba.pdf
    • https://xonutadeb.weebly.com/uploads/1/3/0/7/130775355/f3ccb4c32675.pdf
    • https://cdn-cms.f-static.net/uploads/4416929/normal_60633e3996e6b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jifesu/jenifamizetapixesenaxumev.pdf
    • https://s3.amazonaws.com/vudivuzakal/pajofuvurerafabipidumiv.pdf
    • https://s3.amazonaws.com/zedudo/taxukepigo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2d.bin
da72439d30566ec5282fae8e7a6d3a7c3edf70f3cc484b7be7878379281b1213		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 5600 bytes
font_01_sfnt_off00010115.bin
08df8d324a90e7ffa4b46c579b4cbbc8d58ca50267e98afe1414726b004ec32c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 13736 bytes

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