Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f1694ae3b3a91f…

MALICIOUS

PDF

68.4 KB Created: 2021-03-04 01:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7f31a3909fe62fb8c6aadb7b2b40abb7 SHA-1: 028e75df828f94f418268e36f3bca73dafead85a SHA-256: 71f1694ae3b3a91fe3aeda5338626b733563ec03d2db3200e129e123eacabfb2
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://xajibur.ru/wix?keyword=la+taquiza+menu+el+paso PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499319/normal_5fee731250de9.pdfIn PDF document text
    • http://chestlune.online/gonemipove9gdyl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450244/normal_5fe9762f2399c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445107/normal_603078731a432.pdfIn PDF document text
    • http://uaportal.site/aflatoxin_m1_in_milkatpzd.pdfIn PDF document text
    • https://kofulunaj.weebly.com/uploads/1/3/5/3/135320514/f95b33ff51.pdfIn PDF document text
    • https://wozibasibif.weebly.com/uploads/1/3/4/8/134868806/4a41be.pdfIn PDF document text
    • https://kemigaguni.weebly.com/uploads/1/3/1/0/131070112/vozewiwowo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476578/normal_601fe0735b0fc.pdfIn PDF document text
    • http://reactivaperu-2020.com/dotigumevog2vkd8.pdfIn PDF document text
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/4604092.pdfIn PDF document text
    • https://nefakemibozike.weebly.com/uploads/1/3/5/3/135314079/vovorumokoxojoru.pdfIn PDF document text
    • http://amorexpo.com/sujiviv24cm.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/jidagafinuxesu/34418796300.pdfIn PDF document text
    • http://jimarol.myartsonline.com/sigareme.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_off0000d02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02A 4984 bytes
SHA-256: 53331feaff46a2250ef261d19842834e0d4b926702403d4f9bc44537a46beb48
font_01_sfnt_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 10412 bytes
SHA-256: 26f6a4da2fc5e167ecd1174c2c251f5d589a614f60a2217bf2e4d1935f82b1c1

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