Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf3cad6aff84e23…

MALICIOUS

PDF

74.0 KB Created: 2021-02-27 03:03:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 01160de9425eb19ffc18ad6cd278c105 SHA-1: caf23b685caccd6b1a588cb99f35fb22cdde5285 SHA-256: 6cf3cad6aff84e230a247d60d8daaf209493a836c802fabb39313cccfa6dd95f
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to financial variance, likely a lure to attract users searching for that term.

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://fokemale.ru/strik?utm_term=what+is+total+direct+material+price+variance PDF link annotation
    • http://getbuiss.online/tusovibodabojugapedisilwdkbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_6022c33a329ca.pdfIn PDF document text
    • https://muwevowaxa.weebly.com/uploads/1/3/5/9/135992822/2036441.pdfIn PDF document text
    • https://vipamabukaxeban.weebly.com/uploads/1/3/0/8/130874648/poneneja.pdfIn PDF document text
    • https://genezekanoz.weebly.com/uploads/1/3/1/4/131413678/fokalis.pdfIn PDF document text
    • https://tonawonigavima.weebly.com/uploads/1/3/5/3/135345065/xovalixipe.pdfIn PDF document text
    • http://italywom.space/44939337853eckzx.pdfIn PDF document text
    • http://nibelv.xyz/revidorilew4xpb.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/6311809609814z0u.pdfIn PDF document text
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/jenawuzasife.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/mosezavor/97555837122.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/7315785318.pdfIn PDF document text
    • http://binasizula.rf.gd/lipapuxepobilupejudun.pdfIn PDF document text
    • http://tumexarupikunez.epizy.com/mowobaso.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_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 5388 bytes
SHA-256: 91c5ffedda56f5c67375a301c8ca2072720b1d089f52beb651f13a4dfdb41b54
font_01_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 11560 bytes
SHA-256: 5968cee96b99e95fc5dc3eafbe25596c38b7cbf64db6b5308f11d28380967546

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