Malicious PDF — malware analysis report

Static analysis result for SHA-256 71abfe1174eaccec…

MALICIOUS

PDF

76.0 KB Created: 2021-04-03 22:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 55b58946d82bb719168a0a8b84a7dd6b SHA-1: 33d1d85f7374a8c323a7f627e934fec51f131299 SHA-256: 71abfe1174eaccec3dae087c2a82fba3bcf51e7e895b79cb5bbfb5580ece79bc
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 0.9998

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://baarspo.ru/award?keyword=angiografia+abdominal+pdf PDF link annotation
    • http://health2health.online/widetewaxubafijascrutz.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/idFppgf/infectious_colitis_colonoscopy.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/ghesVss/best_potstickers_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/nijalemivowo/g9ERojc/retroarch_change_emulator_settings.pdfIn PDF document text
    • http://aydym.club/smart_socket_eu_mini_app5i407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_5fd79e0f7152c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500910/normal_602a91e51fa3c.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/dhdhcvQ/zopozozenikavunivosim.pdfIn PDF document text
    • http://ighelpcenter.xyz/books_like_carry_on_rainbow_rowellh4kse.pdfIn PDF document text
    • https://cdn.sqhk.co/bidomutarili/yLDlZji/flyff_harlequin_quest.pdfIn PDF document text
    • http://4kuhd.me/baderigikipobi493r.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/68f28a77-e2c6-4f43-8685-3169ae9d71e1/veritas_prep_reading_comprehension.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_f4bd9e5d15e948ff9f8bb0a044faab3c.pdf?index=trueIn PDF document text
    • https://592f3795-292b-4eb7-bb82-ca7d83343d16.filesusr.com/ugd/44d997_b47db26f271a4dbd9d9be6af42b6aefa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/352bcd39-ca98-407c-8d88-b1c35195cb11/an_introduction_to_project_management_sixth_edition_free_download.pdfIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_da5c1460c45347d5be710ce8db07a8f4.pdf?index=trueIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_9242f48d8fcc45a0ae890cfebcacd2a8.pdf?index=trueIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_85d282c0866e4868bb6bdf03769f2efd.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_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 5312 bytes
SHA-256: 481e22d733ce36a49f0be440b712c3bb57b3058aef3b0e71b748ad8a13b5ac5c
font_01_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 10320 bytes
SHA-256: d6f296c0becb97d09ea797f70138d8d756e65b0f63bf50afe96dedd76aa156bb

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