Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ae7c06d6deea69…

MALICIOUS

PDF

75.4 KB Created: 2021-04-17 11:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8323c3d8cbb9f112be5e867c7c75d821 SHA-1: a12e7085976702690fced5dd3ec929b92f5356cb SHA-256: 95ae7c06d6deea69176417f50f2eda95b81dfd8c30c57aa53762034775736982
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on external services. This behavior, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a malicious intent to redirect users to potentially harmful content or phishing sites. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=how+to+use+x1+dvr
    • https://xepuxewezikute.weebly.com/uploads/1/3/4/4/134437058/29f61337facb.pdf
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/nitozojepawa-rujomizunojel.pdf
    • https://cdn.sqhk.co/nulaliki/6tngfOq/43680602783.pdf
    • https://cdn.sqhk.co/pupevadojas/heidgiR/jilajodorevopudororovut.pdf
    • https://fupixadig.weebly.com/uploads/1/3/4/0/134096542/7769267.pdf
    • https://zilexewutefak.weebly.com/uploads/1/3/4/6/134608169/5105df30c40.pdf
    • http://vaxenovutejuzid.sportsontheweb.net/essential_mathematics_for_economics_and_business_teresa_bradley.pdf
    • https://cdn.sqhk.co/ratevusur/ieie1hf/dungeons_and_dragons_half_orc_classes.pdf
    • https://jabekidedur.weebly.com/uploads/1/3/1/6/131636775/xidubok.pdf
    • https://mepagalupotope.weebly.com/uploads/1/3/4/2/134265457/rulobu_kefovoruwul_foleso.pdf
    • https://cdn.sqhk.co/gipudeviwapi/jggiQgc/82164472486.pdf
    • https://dofidosuxemaxej.weebly.com/uploads/1/3/4/5/134595751/loluguw.pdf
    • http://wozuxel.getenjoyment.net/acute_acalculous_cholecystitis.pdf
    • https://cdn.sqhk.co/goworonol/73jaRih/13378168901.pdf
    • https://xevujudibibabus.weebly.com/uploads/1/3/4/5/134599482/f95babb5f.pdf
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/5438516.pdf
    • https://cdn.sqhk.co/jaxaletadi/jekFigR/zubekuzukarizor.pdf
    • https://bovabesizepin.weebly.com/uploads/1/3/1/3/131383515/c0c99.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5e.bin
814ba6db1afd534ab7613740cc898804f9adc3b97b25accb8b88786f81e01a83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 4540 bytes
font_01_sfnt_off0000ebf7.bin
8acdb2507afc09cbb1a2ebd32d42b8efc2f6084350b3bbe6cc85dc124487d303		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 11416 bytes
font_02_sfnt_off000112ce.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112CE 4324 bytes

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