Malicious PDF — malware analysis report

Static analysis result for SHA-256 4426d73d08ad91c7…

MALICIOUS

PDF

64.3 KB Created: 2021-02-13 10:37:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 258387c40c395e7af57f3c0b5ab9096c SHA-1: e22a1c201c01c9af931e5f4fef2715d1e1fd4265 SHA-256: 4426d73d08ad91c7460550c343dd2509515fd26158c20be15383f7ee0aa4caed
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to link farms, suggesting a SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leading to further compromise or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://leonvi.ru/wix?keyword=rock+cycle+vocabulary+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/moxibusas/fhcGyji/suzenapapafe.pdfIn PDF document text
    • https://pawunotapi.weebly.com/uploads/1/3/1/4/131408062/f5982.pdfIn PDF document text
    • https://cdn.sqhk.co/fasisela/gdCFjgR/vonibozupadedobinerebip.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/ijhdjaR/12200514232.pdfIn PDF document text
    • https://cdn.sqhk.co/rejibebadit/W2jfPKh/goniriretopegomeve.pdfIn PDF document text
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/zolanibog.pdfIn PDF document text
    • https://cdn.sqhk.co/kufedefivuvu/UdWQzKJ/super_slime_ben_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/hiefggB/vuzobazaxupotokakus.pdfIn PDF document text
    • https://cdn.sqhk.co/pifixijowoka/eLjbbfi/sogokaxojugulivopibem.pdfIn PDF document text
    • https://zuvagojajom.weebly.com/uploads/1/3/5/3/135398962/jetewosikolimog.pdfIn PDF document text
    • https://cdn.sqhk.co/lixejudazeza/g0pigey/susepomefokalexuwavopuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/exponential_growth_and_decay_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/best_free_android_shooting_games_2018.pdfIn PDF document text
    • http://minuwugonobusuw.epizy.com/advantages_of_private_limited_company.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECA 5708 bytes
SHA-256: 2f3206d16813180e1abb4066a6307049ed5b65fa915b00af7bc64eb4e4d23f60
font_01_sfnt_off0000d24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 9920 bytes
SHA-256: 373ab15c48bf752c6d272104a6ba9d792572869f435e97e307e1532f18a0ebf5

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