Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac161ab8d2a6315a…

MALICIOUS

PDF

76.3 KB Created: 2021-03-21 02:06:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af472864b25d8fa82103e65027a773e4 SHA-1: 778eb2f95670733e60e286721ec0998cedf28bfd SHA-256: ac161ab8d2a6315a3c01441fa1abe1d39420e100d277a7b3046ec430ec518c1f
164 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one identified as a potential phishing lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to distribute content or redirect users. The 'SE_URGENCY_LURE' heuristic further supports the phishing pretext. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to lead users to a compromised site or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/wix?keyword=mouth+of+a+river
    • https://cdn-cms.f-static.net/uploads/4483354/normal_6022b7f3d40e5.pdf
    • https://cdn-cms.f-static.net/uploads/4421199/normal_60434391554cf.pdf
    • https://static.s123-cdn-static.com/uploads/4366031/normal_5ff433ed1e6b1.pdf
    • https://cdn-cms.f-static.net/uploads/4443326/normal_60567f4d43df5.pdf
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/10a9600.pdf
    • https://cdn-cms.f-static.net/uploads/4445737/normal_60263fad4e13d.pdf
    • https://static.s123-cdn-static.com/uploads/4389085/normal_6005fdb867585.pdf
    • https://cdn-cms.f-static.net/uploads/4388283/normal_60567485685c7.pdf
    • https://bisojobiregabo.weebly.com/uploads/1/3/4/5/134509607/mogupatijos-rigew-xetisam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_3f8a58138a6e498eb6a6cc68c149adf7.pdf?index=true
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_f16ab1a00fc340f3b0051ab750057544.pdf?index=true
    • https://s3.amazonaws.com/jesidofefe/beyond_blue_safety_plan.pdf
    • https://s3.amazonaws.com/nerugiraxura/42601535484.pdf
    • https://s3.amazonaws.com/fosagoba/44488105961.pdf
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_e4ffb6d44d954c8c9f4c595b6adcc78b.pdf?index=true
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_e1bc77fcb17145699c8c20db08a8e77c.pdf?index=true
    • https://s3.amazonaws.com/lomuper/sipabebulakudazumuko.pdf
    • https://s3.amazonaws.com/gixirojozogufux/16919702760.pdf
    • https://s3.amazonaws.com/patilawasu/5403974252.pdf
    • https://s3.amazonaws.com/mufukep/tekudometeg.pdf
    • https://s3.amazonaws.com/bezorito/english_grammar_exercises_free_online.pdf
    • https://s3.amazonaws.com/sixolose/approving_official_test_answers.pdf
    • https://s3.amazonaws.com/vavabi/spanish_indirect_object_pronouns_quiz_with_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd6.bin
24829eb1f2f285385b43469c185fa8a439c391bc8245062a1c76b0a3ebea0ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 4708 bytes
font_01_sfnt_off0000fde6.bin
ee349fd1237ac7a616fe4176bc8ab76186e93efa7869b91ea534efc9219c69cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 11408 bytes

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