Malicious PDF — malware analysis report

Static analysis result for SHA-256 0daea41502a834a2…

MALICIOUS

PDF

77.8 KB Created: 2021-03-23 07:37:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db6f1e9d2ea41f4f98fb86f33e8a68fe SHA-1: dd1c6df90aeee6c6e9d762698dfd0acf0de923d8 SHA-256: 0daea41502a834a24da1079276031e6a0ff86143247426637c60c9b09c3c35af
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/award?keyword=interview+questions+for+manager+position+pdf
    • https://cdn-cms.f-static.net/uploads/4504791/normal_605916b9729c7.pdf
    • https://static.s123-cdn-static.com/uploads/4490746/normal_6005a3bb3ab64.pdf
    • https://xijukuto.weebly.com/uploads/1/3/4/3/134354051/vatulisu-josavijik-lonamoxewi-muxigovokapide.pdf
    • https://cdn.sqhk.co/zubuwebofe/3jbIgeA/pokemon_kanto_black_kbh_games.pdf
    • https://cdn-cms.f-static.net/uploads/4385434/normal_6020a6398f2f3.pdf
    • https://nusupubibirimu.weebly.com/uploads/1/3/1/8/131871553/2966741.pdf
    • https://static.s123-cdn-static.com/uploads/4449779/normal_5ff381c496dab.pdf
    • https://cdn.sqhk.co/vimerokil/haFfjeK/pagiri.pdf
    • https://cdn.sqhk.co/lasukojizix/bhcdwja/gabikuzede.pdf
    • https://static.s123-cdn-static.com/uploads/4456399/normal_5ff8db855afa1.pdf
    • https://cdn.sqhk.co/tosilura/oicxhdl/fisuxe.pdf
    • https://cdn.sqhk.co/rivinodati/cbhB44a/best_web_browser_for_ios_2019.pdf
    • https://cdn.sqhk.co/jidelugob/jagihig/tokyo_xtreme_racer_3_iso.pdf
    • https://cdn-cms.f-static.net/uploads/4386336/normal_6021d047299fc.pdf
    • https://cdn.sqhk.co/xumefugafa/hjiTibS/stickman_rope_hero_3._0_hack_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4503035/normal_603ce85b65894.pdf
    • https://cdn-cms.f-static.net/uploads/4454043/normal_603329528e213.pdf
    • https://static.s123-cdn-static.com/uploads/4446784/normal_600306f175b94.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_bd54e65cfe1042f3ad1534b6fa403ed7.pdf?index=true
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_793ff26217d64dfaa27981bafd312818.pdf?index=true
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_a7b45716a8824c60b6d9dbfe35ade445.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_off0000e572.bin
0a6c7c27b81791ea473b119df412e42f38d252552693b6a3aa7a9492732c02c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 5428 bytes
font_01_sfnt_off0000f7db.bin
305f80e91c11729eb8c287a7256c4741c6768eb05cb243f45c1338b5b3f36236		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DB 10288 bytes
font_02_sfnt_off00011afc.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFC 4324 bytes

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