Malicious PDF — malware analysis report

Static analysis result for SHA-256 f291f81bdb2df1b4…

MALICIOUS

PDF

87.0 KB Created: 2021-03-30 17:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 286c937e4b287c2bd07e335d1b9a46ed SHA-1: 22ae0159432f58881129067e8da4018bf44d1fd6 SHA-256: f291f81bdb2df1b4d5775ed994032fd09c4bb84c1c26e7b636e829fe53e78fa0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The primary URL, https://kuzutuzo.ru/wix?keyword=cue+size+guide, is suspicious. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/wix?keyword=cue+size+guide
    • https://fokinovev.weebly.com/uploads/1/3/0/7/130775288/7392338.pdf
    • https://pedigujelod.weebly.com/uploads/1/3/4/0/134096449/lezuwirimewo-jufakage.pdf
    • https://wuzitefagoxu.weebly.com/uploads/1/3/1/8/131856046/pipeveza_neveb.pdf
    • https://fujulisu.weebly.com/uploads/1/3/4/0/134042697/8ceb5e6012e.pdf
    • https://fesifikigit.weebly.com/uploads/1/3/5/3/135319823/7661924.pdf
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/8812162.pdf
    • http://wupunekum.getenjoyment.net/medical_bacteriology_mcqs.pdf
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/tigeliwenevomuruko.pdf
    • http://kagaromorin.medianewsonline.com/pawiledukubovatogideto.pdf
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/rofopifamobude_powevoxuboxave_xuxofedapa_gekef.pdf
    • https://vixawesomuwevu.weebly.com/uploads/1/3/5/3/135387162/faratipapuvuniwivo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ruzumeb/69483299586.pdf
    • https://s3.amazonaws.com/tedowafomaru/gone_down_the_rabbit_hole_definition.pdf
    • https://s3.amazonaws.com/vexosafugunu/gimuwulupaneg.pdf
    • http://doriponesarom.myartsonline.com/british_english_words_list.pdf
    • https://s3.amazonaws.com/bofake/xoragijijibozi.pdf
    • http://donufuruwitij.atwebpages.com/yasin_arab_latin.pdf
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_9d3dc1b8053846fd99f81f5f65ba0379.pdf?index=true
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_62eb1d8952354039b9c1caf5139c815e.pdf?index=true
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_bd77ad207d9249a9a8802ca792636264.pdf?index=true
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_bf01a1e3e3094e49ba9ec5783e20aaba.pdf?index=true
    • https://s3.amazonaws.com/sebunuzu/how_to_add_number_to_panasonic_phone.pdf
    • 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_off000117e3.bin
25ec5bba310e6f6357c67f98c2a24ebccd44152781d87a1f8379fa951ed0ed98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117E3 4608 bytes
font_01_sfnt_off000127b0.bin
fb5099eb9095a495fd3b5f6f82d0368fe5b696f0a7c28c8c235560da530ac692		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127B0 11544 bytes

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