Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cb62e00fcbb30c…

MALICIOUS

PDF

73.5 KB Created: 2021-02-27 23:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 38e78e2603d48be7531a836062264337 SHA-1: 700b2d8ccd4e88ba095a800f0ec24b47c8d3495c SHA-256: 31cb62e00fcbb30c0034fb6e15f7f54909bd30532ca494cae57205619bfbf231
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to network device passwords, directing users to a suspicious domain. The presence of numerous external links and disposable hosting suggests a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xezojetit.ru/aws?utm_term=tp-link+wr841nd+default+password PDF link annotation
    • https://momimuraw.weebly.com/uploads/1/3/1/3/131384495/7572043.pdfIn PDF document text
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/3072a372920f68b.pdfIn PDF document text
    • https://xazovobarobek.weebly.com/uploads/1/3/4/4/134403102/77969.pdfIn PDF document text
    • https://fazajamol.weebly.com/uploads/1/3/2/7/132740605/banajonusoreb-xovisiwebixebu-zupipijitiwarit-lovow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474727/normal_5fdeefba848fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459774/normal_5fd264b87f31d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tojitobesa.epizy.com/64801146196.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/rokugoguzavuz.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/93895321202.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/65932952910.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/60721302862.pdfIn PDF document text
    • http://pigasupozev.epizy.com/90270061327.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/how_did_odd_thomas_die.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_off0000ddf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 5504 bytes
SHA-256: 7378932aaf835f189226dee4197af8eb7a27db1293529d07c4d4fa640ad3c708
font_01_sfnt_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 12448 bytes
SHA-256: ad20c0780d3df4890b8e5742dab7d17b1194f0e7b7cc95b66179e74997c8251d

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