Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c03c67a0364a0b…

MALICIOUS

PDF

77.8 KB Created: 2021-03-18 04:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3d5cf5c73e7de9cb5d5af3d343d8ca5f SHA-1: 9b14db5600fcd504551e6bed281b91856f33f6e9 SHA-256: 22c03c67a0364a0b0de3ba5682857fcc0346fa78c8dfe7c63c67905cb7c36673
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/123?utm_term=2009+chevy+malibu+ltz+manual PDF link annotation
    • http://pobadabodoz.scienceontheweb.net/how_to_get_free_final_cut_pro_x.pdfIn PDF document text
    • https://cdn.sqhk.co/menigopas/oififgf/90879846350.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413475/normal_5ffa3fad027c7.pdfIn PDF document text
    • https://cdn.sqhk.co/jorisuzil/ggfkRCi/boomerang_channel_schedule_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/logulemuset/Ujfjaie/34_85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fcd9a522ecd7.pdfIn PDF document text
    • https://cdn.sqhk.co/viliwogid/T9gdcmp/download_free_hidden_object_games_to_play_offline.pdfIn PDF document text
    • http://golixudib.mypressonline.com/how_much_do_you_pay_interior_designers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_6041869935337.pdfIn PDF document text
    • https://cdn.sqhk.co/fusuwudofal/mhgchge/w3schools_php.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/xMxhehh/skylanders_swap_force_starter_pack.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/i1wiehb/2020_ugly_christmas_sweater.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387567/normal_6028b79f524b7.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/6i6Rjce/12193384680.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_e1d8c5cd99e94cb0aea99abf17ecfd9e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/decontamination_report_means.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/zamenusizawagekeno.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/26015196857.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_8acfc889d6f34737909f7fcfc115c008.pdf?index=trueIn PDF document text
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_c8a30d87f592496b82f2a149466d73f7.pdf?index=trueIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_7e38b9c0f98b41629c682c9ec88ca4ff.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_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 5452 bytes
SHA-256: b3b244737b616aadd8501974c50d6684d61ea56a65f371e3ecd26f6d4141d810
font_01_sfnt_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 12936 bytes
SHA-256: be561a7a34ef4f3afc2fa4cf520f6a688d3bf3d2f1b249fec68539b402ffcb1b

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