Malicious PDF — malware analysis report

Static analysis result for SHA-256 8246bc49bee785f5…

MALICIOUS

PDF

80.5 KB Created: 2021-06-13 20:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c314198b0a29f788d829bf3aac6a2cdd SHA-1: 59b5991643b61c35ef7fca3f6455afbf0d434129 SHA-256: 8246bc49bee785f518f56725e4e2404ca58cfc6e9c2c6d39482abc51e1ecb81b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URLs that point to other PDF documents, likely to manipulate search engine rankings or distribute further malicious content. The presence of a link to 'kuzutuzo.ru' suggests a potential phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=angular+material+form+field+value PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376625/normal_603f62d8eb568.pdfIn PDF document text
    • https://kabapavubume.weebly.com/uploads/1/3/4/7/134742816/kesim.pdfIn PDF document text
    • https://winiwezunubesu.weebly.com/uploads/1/3/1/3/131379740/576757.pdfIn PDF document text
    • https://warubexe.weebly.com/uploads/1/3/4/6/134647576/2fe863e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369656/normal_5ff2c6efc57a2.pdfIn PDF document text
    • https://loligilifalo.weebly.com/uploads/1/3/0/7/130775627/302eb9f.pdfIn PDF document text
    • https://tenimevu.weebly.com/uploads/1/3/4/3/134315692/1577967.pdfIn PDF document text
    • https://kufoxigokutef.weebly.com/uploads/1/3/1/8/131856815/ferefebotoju_lunizemifiz_gokilosot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416653/normal_5fefddaf69666.pdfIn PDF document text
    • https://pawajapik.weebly.com/uploads/1/3/0/8/130813804/vemuzib.pdfIn PDF document text
    • https://wivusogonelom.weebly.com/uploads/1/3/5/3/135310870/vutinirosogolod_vigepitodozif_sesezusewub_kisuxepufusotaw.pdfIn PDF document text
    • https://risovokoxenixe.weebly.com/uploads/1/3/3/9/133997247/642a4c.pdfIn PDF document text
    • https://vozobixaxodub.weebly.com/uploads/1/3/7/5/137514354/newavaxibogelixabog.pdfIn PDF document text
    • https://rufijaduruki.weebly.com/uploads/1/3/4/3/134311805/467648b922fad64.pdfIn PDF document text
    • https://xepesirivow.weebly.com/uploads/1/3/1/4/131408502/dikozub_lopojika_teperuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_600b60378c136.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/78683489-c452-4982-91fb-e64004a663ff/47484690291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33053c6f-067b-4a36-bc43-a8c2ee9cdbab/breville_toaster_oven_door_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20fac9ed-b7bc-45d9-b239-be5cc16cb2d2/vuwexowifujelipanemave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c006a7a-7a49-43b6-a56d-64631f0f3e5a/sig_p238_vs_p938_comparison.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748a8462-e61d-4f2a-984f-00be68c9251a/sujurenewakasawoleneb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c9c1be1-1f14-47a5-aa55-a54696976209/interview_questions_and_answers_with_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ce14354-e4e7-4874-a555-ea162ea67f67/xisalulefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/446d5e97-f3d5-474e-b2cf-9c09e5788e3d/61209204712.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_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 5100 bytes
SHA-256: 0d42d39a01ca5cb7343426621a74accfe5b15e954f23ec11e4412b4c5f54cc37
font_01_sfnt_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 10868 bytes
SHA-256: b696a9c8342fd431bf79ef3512be00cad2a492e7b2a8606369fdd0466735c6b8

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