Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c29d1aefd61edec…

MALICIOUS

PDF

70.9 KB Created: 2021-01-22 16:38:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 531007ae2bd306bf5dd61d770da8c62d SHA-1: dae72c3cdbcd3c0dc360194c7717ef70c69ef541 SHA-256: 8c29d1aefd61edecae96d35a02ae80571f10d4a2f39218289a1f8951ec693f56
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of numerous external links suggests an attempt to direct the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=anatomy+module+7+study+guide In PDF document text
    • https://cdn.sqhk.co/furaxofir/0mtihFz/zasifivuwupoxezurijimis.pdfIn PDF document text
    • https://pagowabelada.weebly.com/uploads/1/3/0/8/130874520/vavidirefopifoxij.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/R2jdgjh/57747869111.pdfIn PDF document text
    • https://cdn.sqhk.co/xifusajexom/hiipyij/sticker_maker_for_whatsapp_plus.pdfIn PDF document text
    • https://telenegogak.weebly.com/uploads/1/3/4/5/134522167/d9f3be3cfc.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/jiifAic/xumonagedexetuvasugi.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/hjfhfjd/gidepoxokovij.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/ipYiahi/98501031851.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/wanasuvedigo/indemnity_form_template_personal_training.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/timeline_template_timeline.pdfIn PDF document text
    • http://lisunamubeso.epizy.com/88009563033.pdfIn PDF document text
    • http://fusarafabar.epizy.com/performance_parts_for_diesel_cars.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/tevalajotofunanexi.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/37015387011.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_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 5220 bytes
SHA-256: 3c2e60a184c8ec6b73df04a13e4d40d61008209167fb39a284d6b99eaa19aefc
font_01_sfnt_off0000eb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 10648 bytes
SHA-256: ae26b11973d133e02c3d7792878314ab35bd7d74a303080912a73c7305ad483d

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