Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3df50abd050acce…

MALICIOUS

PDF

71.2 KB Created: 2021-03-21 22:29:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7f5c3ba1af230d04dfe6f6bcdf34af18 SHA-1: 9134a68a0a191842b1bcdcc6423a1afadc18d64a SHA-256: b3df50abd050acce47fc34a597e3fc16a9d0626b0314db733cbcc242f5fadf13
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://ponafet.ru/123?utm_term=foamex+board+sheets', is particularly suspicious. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ponafet.ru/123?utm_term=foamex+board+sheets PDF link annotation
    • https://cdn.sqhk.co/pavujakorige/jhCgez2/vinidutuluzapukep.pdfIn PDF document text
    • https://cdn.sqhk.co/nurafurofopu/BkOhhNS/latedititoperazagemozu.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/j5kvgf2/flappy_bird_deathrun.pdfIn PDF document text
    • https://gewipilozu.weebly.com/uploads/1/3/0/7/130775211/6978981.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/wjghisL/python_monkeyrunner_install.pdfIn PDF document text
    • https://jofufibiwew.weebly.com/uploads/1/3/5/3/135347649/kubazezuxad.pdfIn PDF document text
    • https://cdn.sqhk.co/pakebisas/ZPgctyS/rewolaj.pdfIn PDF document text
    • https://waperimawomexav.weebly.com/uploads/1/3/4/7/134733778/xenogi_vuwumif_vagirexap_lonitigavusobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd029d04-ab19-473d-8797-6c2382a829bc/32303441546.pdfIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_fbb9c98149e04051aeae6d2a370a0ed9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea4e8fe2-e12d-414d-a5fa-355d0901b7f6/97343957046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0d3d4b6-967b-42e3-9ebd-ad3f29103f07/sony_playstation_vita_lowest_price_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/93790224888.pdfIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_69a004d7323541fe86f299c0b2e1ba81.pdf?index=trueIn PDF document text
    • https://8b5afee3-0910-434e-979f-4bfc74428cf5.filesusr.com/ugd/0bcf16_c2ff9885a6ab40d1b78ea3bad3dcba85.pdf?index=trueIn PDF document text
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_e9f878c263494e02ae8fa6d49ddae147.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/popilo/gadumasezuxumokajo.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/mars_is_heaven.pdfIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_43cbc4a27c2e4e06b6518ca61d4283e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf8a15e-306e-425e-a93b-cd85b792c2eb/toginuwedovix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f59f54a-036f-421b-a7d4-a513c920dfa0/what_are_the_conventions_of_traditional_literary_genres.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_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 5196 bytes
SHA-256: 8d37f7e50d81d08ac92bb6f3ba5703ef88303e74cab725243fa2e834dee0a868
font_01_sfnt_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 10888 bytes
SHA-256: 7027eca8933f0c0a69eedf5f681285d180bbd967277bb215d42fd0e1b146570f

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