Malicious PDF — malware analysis report

Static analysis result for SHA-256 81cfe171a53711e7…

MALICIOUS

PDF

89.5 KB Created: 2021-04-29 15:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4310a0cf1a3dd0cdbb1b0d437731762a SHA-1: eaac07529f072c9358ff3addbaa10f10b6a063f9 SHA-256: 81cfe171a53711e7a64e090f526b335673e8368c8cb1e712811fdf8a59129e69
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary external URI points to 'https://ponafet.ru/strik?utm_term=armor+of+god+kjv+explained', suggesting a phishing or malicious content lure. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-10044376-0', reinforcing the malicious classification. The presence of embedded URLs and the ML classifier's high confidence score further support these findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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/strik?utm_term=armor+of+god+kjv+explained PDF link annotation
    • https://woxopipuwesubaj.weebly.com/uploads/1/3/1/4/131453061/wokiguni-xuwusovosu-xokotesu.pdfIn PDF document text
    • http://cocobeautybar.ca/baldurs_gate_2_release_date_ps4fn5da.pdfIn PDF document text
    • https://zexotanus.weebly.com/uploads/1/3/0/8/130873712/renok.pdfIn PDF document text
    • http://phtech.site/63191324031xzlhx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501383/normal_5ff3b8214ca70.pdfIn PDF document text
    • https://zefisazivite.weebly.com/uploads/1/3/5/3/135314851/desezalojujufu.pdfIn PDF document text
    • http://sefexetewizu.iblogger.org/80077100614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_604ec451caa49.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/cs_deals_bot9c0ez.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/pibajuwi/sarkari_answer_key_2018_up_police.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/mubatalarafetovutaruja.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/piponarorofedirumunosaw.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/hungry_shark_heroes_mod_apk_2._3.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/radototule.pdfIn PDF document text
    • http://xodemomawul.epizy.com/77128906631.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/factual_report_text_about_handphone.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/cessna_421_maintenance_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/16245095486.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/2570416028.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_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 5440 bytes
SHA-256: 2d173835397332565fc8fcecef53e18cb2f5843b44a5c8a302f6873543ed8cea
font_01_sfnt_off00012fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE1 11552 bytes
SHA-256: 695dbf819ff85b1ec6c74e57151457ced7fb92cfdbe0c3b4598485dfc58be1d5

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