Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24e081e34fc4b16…

MALICIOUS

PDF

75.3 KB Created: 2021-02-28 11:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7ee7e1b65a7ca86d94f9952f273c6456 SHA-1: 0e2eccdc989a7b4b64e109d8dfad97f608dde350 SHA-256: b24e081e34fc4b16a8b3784e2e83af7bf467d42de02197c8381331db4207abdb
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to search queries, further supporting the lure of a phishing attack.

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://fokemale.ru/strik?utm_term=why+did+taco+bell+menu+change PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5fd9e4b0667fc.pdfIn PDF document text
    • https://xebexusutawa.weebly.com/uploads/1/3/4/5/134502291/rabizoxiwo_sibujuzupipejal_fapisizekelodun.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/86733644180.pdfIn PDF document text
    • http://olx-delivery.cc/pekosovofunokosurafokoic14.pdfIn PDF document text
    • http://vorgazme.com/20762052087cgqvg.pdfIn PDF document text
    • http://alfa-quest.ru/18756566182cltbu.pdfIn PDF document text
    • http://helpcopyright-service.com/585096406885796j.pdfIn PDF document text
    • http://homiak.fun/aquasource_faucet_valveq2oph.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419630/normal_5fdda71537eb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_602006f4b6e13.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/gaxudeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5fd16f904ef78.pdfIn PDF document text
    • https://lubexunomug.weebly.com/uploads/1/3/2/6/132696146/7241247.pdfIn PDF document text
    • https://letezinujafi.weebly.com/uploads/1/3/4/9/134901841/bowudefedepo_rarij.pdfIn PDF document text
    • https://tinulesuse.weebly.com/uploads/1/3/4/6/134689832/vuvubulewup_bogapawebovo_kikurozuwav.pdfIn PDF document text
    • http://auto-fishing-rods1.club/82000917224d3p1.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/vibasujefir/wapiwunajetabojumal.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/88545328976.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_off0000eaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 5332 bytes
SHA-256: 951828e31ff25eeda5102aa96baf05aa81456293660db51a76bf39f8254550d9
font_01_sfnt_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 10292 bytes
SHA-256: 1c7703e891d3b9ce0e5ea4fbd778833631461d22232051a104dc42a32c6e1488

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