Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dc9e2fcaf9fe28…

MALICIOUS

PDF

95.5 KB Created: 2021-03-26 08:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b37053a16bfc2f4fedcc9c79b30c5650 SHA-1: 8320678d4501d26fe981f49edb02553604bd0cf8 SHA-256: 23dc9e2fcaf9fe284748ebd5fe8d5e2f6c3cb5f05acbe50799b85ab745ac790f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are disguised as legitimate documents, indicating a link farm for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded URLs point to suspicious domains, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=cisco+chapter+3+exam+answers+version+7.0
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/9850509.pdf
    • http://kejoxemubogese.mywebcommunity.org/judibosaz.pdf
    • https://ziwivebagojub.weebly.com/uploads/1/3/1/8/131871618/6b0dc389a28.pdf
    • https://vojituletakez.weebly.com/uploads/1/3/0/8/130874409/7483458.pdf
    • https://cdn-cms.f-static.net/uploads/4427519/normal_60393711d23ea.pdf
    • https://cdn.sqhk.co/mojuzizimu/6hio9jg/93181755284.pdf
    • https://cdn.sqhk.co/nowonipewo/ijahi0F/49850230152.pdf
    • https://cdn.sqhk.co/muvotugi/gIT4gAL/fitokalorosipulamawo.pdf
    • https://cdn-cms.f-static.net/uploads/4459318/normal_601a68456196a.pdf
    • https://static.s123-cdn-static.com/uploads/4416790/normal_5fe4028c5e9b1.pdf
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/9ab40f.pdf
    • https://cdn.sqhk.co/vedimofaw/jQiaoyi/dungeons_and_dragons_board_game_characters.pdf
    • https://denijebif.weebly.com/uploads/1/3/4/5/134584122/didamavorejin-nudevojexu-vugirurorefes.pdf
    • https://cdn-cms.f-static.net/uploads/4380867/normal_602ab3ba7dc81.pdf
    • https://cdn.sqhk.co/parabeset/ghw1sbC/super_nes_emulator_android_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_55ac85181f18437b80bd774c4ea4e01c.pdf?index=true
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_ea49ebdf8bc945db85cc7717013d3370.pdf?index=true
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_65135042d3f94a77a001aa9266466f60.pdf?index=true
    • https://s3.amazonaws.com/kubafezin/xubosupifebufuvekitojogaf.pdf
    • https://s3.amazonaws.com/kafises/67368566607.pdf
    • http://sogivuwe.onlinewebshop.net/valores_normales_de_cetonas_en_orina.pdf
    • https://105d84dd-9b22-4355-af37-21382b2db671.filesusr.com/ugd/f4243a_bb89fbc1d4144fbc8aaa8b6c9de9d3fe.pdf?index=true
    • https://s3.amazonaws.com/pizexopenaxu/60153624287.pdf
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_96cb9d9fd08c4621949167ee6f7e8db1.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001286f.bin
fbff53d1136bfb97bfa3850c4742d5c820e56f916e5eebd86dafe09afb6ba4b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1286F 5592 bytes
font_01_sfnt_off00013b6b.bin
73a30911e029b0bd2f9642deab1420c6271d6e561cca3c1fd92bed122cb579f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6B 10788 bytes
font_02_sfnt_off0001601f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1601F 4324 bytes

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