Malicious PDF — malware analysis report

Static analysis result for SHA-256 22485b426f37fcf2…

MALICIOUS

PDF

68.0 KB Created: 2021-03-20 20:57:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 194990238206368f5b6df9f570f970e2 SHA-1: 1bd27245b598e773748c76ba9703beb314cc3a62 SHA-256: 22485b426f37fcf2a72a7fc4640d9e133b5a87f8dacaa2ad6591b36b5219dfac
186 Risk Score

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 0.9998

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://fokemale.ru/wix?keyword=batman+hush+t%25C3%25BCrk%25C3%25A7e+pdf PDF link annotation
    • https://tusululobiwivet.weebly.com/uploads/1/3/1/1/131163859/93662.pdfIn PDF document text
    • http://migerov.xyz/542586942417q805.pdfIn PDF document text
    • https://zukixuvaxetili.weebly.com/uploads/1/3/5/9/135988851/volitonogixugu.pdfIn PDF document text
    • https://zavegaligap.weebly.com/uploads/1/3/4/4/134499553/2612757.pdfIn PDF document text
    • http://rodsfish.club/5_interesting_facts_about_marseille_francekb28w.pdfIn PDF document text
    • https://pemilixip.weebly.com/uploads/1/3/5/3/135330450/1235085.pdfIn PDF document text
    • http://baugroup.info/wotubewe7z3nt.pdfIn PDF document text
    • http://4gusevshop.space/how_to_make_my_kawasaki_mule_fasterp3e8o.pdfIn PDF document text
    • https://budafamilefa.weebly.com/uploads/1/3/1/4/131452884/feninofujit.pdfIn PDF document text
    • http://uniques.space/free_social_stories_uk0mte3.pdfIn PDF document text
    • http://webcam-model.online/how_to_use_health_o_meter_weight_tracking_scale24ikh.pdfIn PDF document text
    • http://frankiearvelo.com/how_to_use_the_lincraft_knitting_machine4lp5t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_5b0fffd9430c4394875ebfd772e13170.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_5d9d82b786b64b1b8e5e4e15b99164d4.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_61fe2b8d0f1f4b55bce31815970b91f6.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_2d68f7fd0d2643b5823c29d144a75d8f.pdf?index=trueIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_fb793d0587cf430b89075df4b26550ca.pdf?index=trueIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_9bb9a0bb793f44e89b37e478a5dca190.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_32e03e1e3d0d4539b72e7b6beb2cfee1.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_off0000c96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96A 5664 bytes
SHA-256: f88d69aa332d38717d2e181fa77ba0a7a957a63c75063202bb7b4fbdd67610c1
font_01_sfnt_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 11312 bytes
SHA-256: 15fe4899ccbe03a6ffc33e6b7434a877130b01bddd6da38834cf4caecbe52ca6

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