Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ea157f22927294…

MALICIOUS

PDF

83.7 KB Created: 2021-03-13 17:16:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7592e8f2c1189d84a17e87104d262d9d SHA-1: d227581d1d9b3e857e204889fc1a0bb6ead4a3e2 SHA-256: e9ea157f2292729422db99d4f2317517711a1aafad860936cc8847785c43f8d7
164 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a phishing and trojan threat. It contains a large number of external links, many pointing to PDFs, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'graphic design software', likely a lure to disguise the malicious intent of downloading further payloads from the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=graphic+design+software
    • https://cdn-cms.f-static.net/uploads/4390638/normal_602c5db3a86b4.pdf
    • http://sibatike.getenjoyment.net/44285247460.pdf
    • https://cdn-cms.f-static.net/uploads/4380863/normal_601a5812217da.pdf
    • https://cdn-cms.f-static.net/uploads/4457876/normal_5feaef36f3389.pdf
    • http://xelasurugopu.mywebcommunity.org/internal_combustion_engine_parts.pdf
    • https://cdn-cms.f-static.net/uploads/4404500/normal_60238ddb3a89c.pdf
    • https://cdn-cms.f-static.net/uploads/4387224/normal_5fea236c7c2a0.pdf
    • http://9gusevshop.space/mcdougal_littell_modern_world_history_patterns_of_interaction_teachers_editionuenqa.pdf
    • http://sneakerspapa.store/2240440673jfj9z.pdf
    • http://golden-charm.ru/can_you_audio_from_facebook_videosi8zly.pdf
    • http://afracheat8.xyz/data_science_course_syllabus_iiit_bangalore1covq.pdf
    • https://wujadagepixiv.weebly.com/uploads/1/3/1/8/131856877/pabofapevedi.pdf
    • http://raisinsapp.club/how_to_describe_sunlight_through_trees07scb.pdf
    • https://kobuzonoge.weebly.com/uploads/1/3/1/4/131452837/b17990b7de690.pdf
    • https://static.s123-cdn-static.com/uploads/4426279/normal_5feb713a819a3.pdf
    • http://kigurumi.org/253447107248sm4p.pdf
    • http://bbflowers.net/10016061135xi7of.pdf
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fd65607ea695.pdf
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5fd67295bd387.pdf
    • https://cdn-cms.f-static.net/uploads/4446399/normal_601e46f61b5b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b2d.bin
4b12fff97cee7fe51dd886af2dc90088650d6aa4fe0ce22464fab5d477db5521		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 5508 bytes
font_01_sfnt_off00011df5.bin
c78f9e9c260c473259db65713eab116696d0a5aff9aa9a48092cc05f222c0c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 10600 bytes

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