Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a13a7eb61acfe7…

MALICIOUS

PDF

77.7 KB Created: 2021-03-11 13:18:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaec2becbe90ec5297ff6e3c1c2e41be SHA-1: cdf76734035c587026a8a940bd81180ce337f0ca SHA-256: 12a13a7eb61acfe700685ce459581d360e9489b9058b05e4c144752e3a3bfea8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains a large number of external links, suggesting a link farm or redirection mechanism to host malicious content. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest the intent is to drive traffic to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/award?keyword=cd+action+1998+pdf
    • https://cdn.sqhk.co/kofuvufexo/hbr1nDN/probability_density_function_questions_and_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4460981/normal_60220a404a2e9.pdf
    • https://rufeguduti.weebly.com/uploads/1/3/1/3/131384240/nunobujo-muvutujelokemi.pdf
    • https://cdn.sqhk.co/wuwexosul/jukQLF3/shogun_japanese_grill_sushi_bar.pdf
    • https://static.s123-cdn-static.com/uploads/4408479/normal_5fcb21573939b.pdf
    • https://cdn.sqhk.co/sunomedude/iahjhib/22777169585.pdf
    • https://cdn.sqhk.co/mixubiki/f0gg5uS/39052475421.pdf
    • https://cdn-cms.f-static.net/uploads/4387410/normal_601717b071b7e.pdf
    • https://zosonokabawim.weebly.com/uploads/1/3/4/3/134316026/3c4c3278.pdf
    • https://budekimezarusij.weebly.com/uploads/1/3/5/9/135964348/sotiwe.pdf
    • https://tuloforukidape.weebly.com/uploads/1/3/4/7/134752744/2166c3fba.pdf
    • https://rowagikej.weebly.com/uploads/1/3/4/6/134678960/vowifol_legibazet.pdf
    • https://cdn.sqhk.co/guzufaseba/Wiigjgg/vuvejajoxerafaru.pdf
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5feb173f3a198.pdf
    • https://xefobizedep.weebly.com/uploads/1/3/1/6/131636625/pixukaniwap_mezevik.pdf
    • https://penogefuf.weebly.com/uploads/1/3/2/7/132740618/xukupelowigerob-dozafufijakereb.pdf
    • https://jozisanolotodix.weebly.com/uploads/1/3/0/9/130969335/6e186f36ce3455.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_0602d2ea640f47ba8d093665bd23885b.pdf?index=true
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_9091f18201354943bceb2d2a872a06f7.pdf?index=true
    • http://desetezovadu.epizy.com/breviario_italiano.pdf
    • http://seromol.epizy.com/bsmmu_e_registration_card.pdf
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_a939796001004bb89106c6eacf872c4c.pdf?index=true
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_546258c8d3d342739af7e43257593cea.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_off0000f4c5.bin
4150198e643344ff9deaa81792f6b8125cb1c77d425613b43aeed498aa0843d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 5148 bytes
font_01_sfnt_off00010666.bin
79dbcaea918f70cd12bc780e40d25e947eee8dbd89750593c84da027ea6c4753		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 10276 bytes

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