Malicious PDF — malware analysis report

Static analysis result for SHA-256 09168e7656e39171…

MALICIOUS

PDF

78.9 KB Created: 2021-04-04 21:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c3d528a11667498fd988740fdee0dcc6 SHA-1: 5677dc0f464ca2a2c5846242e943bba3fca7ff49 SHA-256: 09168e7656e3917124de6872493a155e66a72b6c09b41726ce3f1ae536312694
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 0.9996

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://crophysi.ru/wix?keyword=avast+antivirus+2020+free+offline+download PDF link annotation
    • http://pipvip.ru/what_does_the_word_chaos_mean_in_spanish8aaku.pdfIn PDF document text
    • http://wide-take.top/8813674509qkb8t.pdfIn PDF document text
    • https://wuvipovuzodex.weebly.com/uploads/1/3/4/8/134846945/9593102.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/sedepixuxugoni.pdfIn PDF document text
    • http://jakartapro.xyz/free_grammar_lapbook_templatesye342.pdfIn PDF document text
    • http://fc-aromat.ru/the_bacchae_william_arrowsmithlnlue.pdfIn PDF document text
    • http://swiss-family.space/zowukozepubugizosh320u.pdfIn PDF document text
    • https://sorurilinoko.weebly.com/uploads/1/3/5/3/135397097/bewigo-xomogur-vubujitu-kifivijuzosese.pdfIn PDF document text
    • http://es50off.pro/ih_farmall_trucker_hattn6c2.pdfIn PDF document text
    • http://abzac.me/bodawawozenokujobekovst20.pdfIn PDF document text
    • http://top-agent.ru/day_of_fate_spirit_vs_spirite5fd2.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/rama_judicial_colombia_consulta_procesos_por_cedulatftb9.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/928061fb-cab7-43db-ad3a-9465fbab711a/vowul.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_fdc5b8848f5d446a9630b38daee8fe42.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/723ce63d-1717-45ff-9f87-72012ce781df/rokosuxu.pdfIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_a6c47c252cd4413eb39180a225042023.pdf?index=trueIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_6698924dd365476bbb52030eea008277.pdf?index=trueIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_c4026b27d9bf4492bcd614fb1729cc93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead7d590-d206-4719-b51d-e34b4c22313b/who_invented_the_first_telephone_and_what_year.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_8dbcac21e0cf4df2bd36a30e56fc2498.pdf?index=trueIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_01e6c87390d1478282a5567dad10014f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68428825-a61b-41d3-b128-2fd7c108cc6f/love_simon_book_quotes.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_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 5316 bytes
SHA-256: 56a49a4dda860de9a27d0c604fe96bfcc5f8bc4483568812a38eba958e451189
font_01_sfnt_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 10516 bytes
SHA-256: f66207a33586c9f087a9d4e71ff713b2aa78d5a2253f2f15cda503cd1d481623