Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c21d8390ffdf09…

MALICIOUS

PDF

64.0 KB Created: 2021-03-19 13:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80b06f7ce4b54b3ece60d2bd4f9b7c0d SHA-1: b455c32fb9cd8a1b363c9f0548ad3f9c88df6e11 SHA-256: 26c21d8390ffdf0965acfb9073f437434e080d04b5b8e8e0f8e0a0654013fb6c
184 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to potentially malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8428

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
  • 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
  • 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://seumenha.ru/123?utm_term=irving+berlin+always+sheet+music
    • https://static.s123-cdn-static.com/uploads/4410976/normal_5fec8c7d2298f.pdf
    • https://static.s123-cdn-static.com/uploads/4375886/normal_6003173ed6b30.pdf
    • http://xivisugewikoju.iblogger.org/sijeridikad.pdf
    • https://cdn-cms.f-static.net/uploads/4469633/normal_5fea2312b3a9b.pdf
    • http://big-ita.space/91780014129etfyu.pdf
    • http://presentinsta.site/762550954881vr01.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://disejeninajexak.rf.gd/bipartisan_campaign_reform_act_of_2020.pdf
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_099425e7251a4e6293c6a05a3aa45317.pdf?index=true
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_1b866889bd3a4fee8465d33c64dfe8a0.pdf?index=true
    • http://zijemuviwovo.rf.gd/london_evening_standard_crossword_answers.pdf
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_cc0ded22c14c4a8d83e5684e61be303e.pdf?index=true
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_35656d2411b64cc6b6691d17c1c89240.pdf?index=true
    • http://dikefesuzu.epizy.com/63192343094.pdf
    • http://sonupon.epizy.com/vintage_schwinn_dx900_stationary_exercise_bike.pdf
    • http://fidawakuxut.epizy.com/wujune.pdf
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_1c599346c77944e7805b1dd809a23d9f.pdf?index=true
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_55811b16e2134186a4f05c77395545fc.pdf?index=true
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_810cdf91a2f54dd59bf4ea1d2d60be1f.pdf?index=true
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_9cfb8157a2c24d62997391e3bb1bfb4f.pdf?index=true
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_338ea2c3bfcf4bf8b6113a697cbea361.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d533.bin
ccffe394b76899753b6d13e605b8ad78fd8ce0434d5b45312f7a8816326dbd27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 5544 bytes

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