Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aae38d96f827808…

MALICIOUS

PDF

97.9 KB Created: 2021-05-10 04:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b6d70c42aecfd12e264cd7a18cf4600 SHA-1: b1f3743d1d4c24bd7a8c40950287691e8052952f SHA-256: 3aae38d96f82780861b4f26ffa078277bd4a9ac9713ac9c9db968b3d62988ee7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism to distribute malicious content. The document body, though heavily obfuscated, appears to be a lure related to transit information, aiming to trick users into clicking the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=nj+transit+essex+county+bus+map
    • http://tadosuzewamu.medianewsonline.com/can_you_whitewash_with_chalk_paint.pdf
    • https://mekesenewinev.weebly.com/uploads/1/3/4/2/134234563/3780729.pdf
    • https://static.s123-cdn-static.com/uploads/4458622/normal_5ff68e6ccdf26.pdf
    • https://cdn-cms.f-static.net/uploads/4407813/normal_60130e98b4df4.pdf
    • https://cdn-cms.f-static.net/uploads/4416512/normal_60463b4bdcca9.pdf
    • https://gadikidaju.weebly.com/uploads/1/3/1/3/131379663/2473904.pdf
    • https://zajewovebuvi.weebly.com/uploads/1/3/0/7/130739158/piwulakuguf.pdf
    • https://cdn-cms.f-static.net/uploads/4475720/normal_60463af02d7d9.pdf
    • https://static.s123-cdn-static.com/uploads/4451954/normal_5fc9873691774.pdf
    • http://inmyshtangen.xyz/fumedbs9cq.pdf
    • http://alexandreablog.com/27456320674kr6qc.pdf
    • https://static.s123-cdn-static.com/uploads/4446511/normal_5fe1aff896d3b.pdf
    • https://cdn-cms.f-static.net/uploads/4443342/normal_602a43fd07fb7.pdf
    • https://static.s123-cdn-static.com/uploads/4367674/normal_5feb5f3199ba0.pdf
    • http://kadaxejob.mypressonline.com/vusetulowixafe.pdf
    • https://static.s123-cdn-static.com/uploads/4411219/normal_5fcaae6b75a84.pdf
    • https://kigolakelo.weebly.com/uploads/1/3/1/3/131380934/kukuseziwef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_0435f7f7f2354d6d8d7ab805fef903bd.pdf?index=true
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_0010c3c6564049488ff529c8d03d265d.pdf?index=true
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_acd47c4a750b483a9e2b47ad3d47696a.pdf?index=true
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_d8cc89adea514dcbb2506f0755c311ce.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140aa.bin
9cae4d906e06694decdcd1e17c6dc137d02525a8eb493f178acfcfba2ab771ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140AA 5404 bytes
font_01_sfnt_off00015305.bin
437fce7037ed9edde62265c3d6997ec64d0b97a3a3800f4f730f06f73e2a34f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15305 11556 bytes

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