Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3846d4875295cb7…

MALICIOUS

PDF

76.0 KB Created: 2021-04-06 17:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d960cdf0eae8d4cd2e5f69e999585c70 SHA-1: 56c72547fc660e20a24a5b48fdd00f70c8a02721 SHA-256: a3846d4875295cb76bb86dc577d3dd7822382dd28f1c4f15876b51f09099b00b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/aws?utm_term=how+full+do+you+fill+a+mini+bundt+cake+pan PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422637/normal_5ffab3c04406a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380528/normal_5fe01119938d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413978/normal_60295eec26d75.pdfIn PDF document text
    • http://rankingcoach-seo.com/how_much_is_a_miniature_dapple_dachshundlo48k.pdfIn PDF document text
    • http://insta-sale.site/xalafalabotajanawudel03rt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_6024b155d499f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_600b42ad4c2d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446155/normal_6056acb041497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457862/normal_601cfd5532d83.pdfIn PDF document text
    • http://detonicufficiale.website/39050974953a3x6y.pdfIn PDF document text
    • http://ibkreactiva2020.com/63421163525amkhi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417321/normal_5fde68d0cf00b.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/27642782056nvipb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492900/normal_5ff9bd4092b1a.pdfIn PDF document text
    • http://abwaab.su/lilaxamadamqp4hx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470552/normal_6040fb0d23b2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459796/normal_6007e65f70fc3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_e149560347c44beebce001bbc64334e2.pdf?index=trueIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_180ed87ba5d9419fb7a7bee51744bd6e.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_e90143da9fd64cb686c441feb4d9d55e.pdf?index=trueIn 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_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 5384 bytes
SHA-256: 8691ed033987bf6296eb299ae1ddf184c2e5835abe41be9679e611dcbaf179f6
font_01_sfnt_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 10788 bytes
SHA-256: 894e233eb1b8f719c6e2244b2847ec5469d63fe8fb44c5efb0c7f71da7176922

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