Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41c8d8c59330701…

MALICIOUS

PDF

77.2 KB Created: 2021-03-29 00:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a147a0bbeb43658768eb376fe128add4 SHA-1: 1008359a9dcdc2836c0557854c45ccfcf6f3f184 SHA-256: f41c8d8c59330701d34ce71cc470072d5a8784bcd0b260eca955973f12de0679
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

Heuristics 5

  • 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 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://xajibur.ru/award?keyword=anatomy+lower+limb+mcqs+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393772/normal_60579eaee3c30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_602d99bd1a711.pdfIn PDF document text
    • https://lufegema.weebly.com/uploads/1/3/4/1/134132410/6125e.pdfIn PDF document text
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/9049370.pdfIn PDF document text
    • http://milanbeachs.space/adverb_clauses_worksheet_with_answeruzgpp.pdfIn PDF document text
    • https://zobigitesi.weebly.com/uploads/1/3/4/6/134691723/xiwugip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449181/normal_6034e2d361798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462688/normal_605619e10983a.pdfIn PDF document text
    • https://vuzazaba.weebly.com/uploads/1/3/0/8/130813658/4049530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463803/normal_5ffdadc6aa1cf.pdfIn PDF document text
    • http://quinzsy-studio.design/36927323430kp03h.pdfIn PDF document text
    • http://daliadiago.com/countersnipe_mod_apkokuy7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465397/normal_6009d40660289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467560/normal_60121b7e2f148.pdfIn PDF document text
    • http://tersq.space/national_achievement_test_reviewer_for_grade_62p15a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419003/normal_6002085a39103.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/cc2be2a2-76f1-4391-843b-0bd00944c622/2019_ram_1500_big_horn_quad_cab_4wd_towing_capacity.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/70712123752.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/vaastav_movie_aarti_song_320kbps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a36510df-84cd-40a9-8e01-de5377af16d9/45654773342.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/elementary_differential_equations_with_linear_algebra_4th_edition_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/what_is_crisis_intervention_theory_in_social_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45732e46-83dc-429d-9be9-8acb6e4aaf03/dusof.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_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 5748 bytes
SHA-256: 335fce6289183d179454cc3b267045711eef3c4838f44730527cd6fcbc1c7a38
font_01_sfnt_off0001037c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 10492 bytes
SHA-256: 83316c3184b6f428a3e21e6295f3c0c27bad1b0183e874a23affd98da7ffcc98

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