Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c67f530addb1d1…

MALICIOUS

PDF

85.2 KB Created: 2021-03-29 07:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0204598b8ce6c0f573ef3419308615e7 SHA-1: 9cc0abb56ffd48d2e4676b68223210d210d55ff7 SHA-256: 92c67f530addb1d1c3a2657da37808225f412c448aa0db9b718f0af142908b0b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://ponafet.ru/aws?utm_term=what%2527s+the+best+dovetail+jig', indicates a lure related to woodworking tools. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

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-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://ponafet.ru/aws?utm_term=what%2527s+the+best+dovetail+jig
    • https://cdn-cms.f-static.net/uploads/4413848/normal_603e07ebe1b64.pdf
    • https://static.s123-cdn-static.com/uploads/4408851/normal_5ffd3b33f0846.pdf
    • https://static.s123-cdn-static.com/uploads/4463005/normal_6007bce015efd.pdf
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/0e01d283ea414.pdf
    • https://sebikiwar.weebly.com/uploads/1/3/5/9/135962157/9162052.pdf
    • https://cdn-cms.f-static.net/uploads/4465252/normal_5fdad61d55dc0.pdf
    • http://pafowitowa.medianewsonline.com/basic_life_support_red_cross.pdf
    • https://static.s123-cdn-static.com/uploads/4469643/normal_5ff9f4c768e4b.pdf
    • https://static.s123-cdn-static.com/uploads/4476941/normal_5ffe95dd53ef1.pdf
    • http://korogesubelokut.mypressonline.com/29060484113.pdf
    • https://cdn-cms.f-static.net/uploads/4414851/normal_600a3dc3979a5.pdf
    • https://cdn-cms.f-static.net/uploads/4501374/normal_60354b49daa33.pdf
    • https://static.s123-cdn-static.com/uploads/4390071/normal_5ffe526546eaa.pdf
    • https://duvafoxugijotad.weebly.com/uploads/1/3/5/3/135305538/5433850.pdf
    • http://ruxenawuxovogu.getenjoyment.net/zafina.pdf
    • https://cdn-cms.f-static.net/uploads/4406497/normal_603cabef280f0.pdf
    • http://juwupexutaval.mywebcommunity.org/71861305513.pdf
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/juger.pdf
    • https://cdn-cms.f-static.net/uploads/4474997/normal_601bcb9f302c9.pdf
    • http://rusewigojubilon.mygamesonline.org/dujamodozozibojel.pdf
    • https://bokonipazesokut.weebly.com/uploads/1/3/1/3/131398478/jigagavud.pdf
    • https://tagakokiginozol.weebly.com/uploads/1/3/0/7/130775172/bazazunotosaxasusexi.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_off00010bec.bin
f6c4c7a5afb80090e16afb9308159d3437f8550f1c42834896f3259cb9998a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 5316 bytes
font_01_sfnt_off00011e1a.bin
db34b4c7e35471b39376386c7b169216b7158cd050358223afc2421684c2d3e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 12244 bytes

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