Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f2290b7f283a32…

MALICIOUS

PDF

82.9 KB Created: 2021-02-21 03:22:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6d24dce0834b198964cb7e1b12f86592 SHA-1: bea9cee92698d8743f2942abd94b34b892696926 SHA-256: 20f2290b7f283a32605f161ddd94de6f773febe6878710ab9d0cff25c5cd514c
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed for SEO manipulation. One critical heuristic indicates a link to known malicious redirector infrastructure, suggesting the primary purpose is to lead users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=sap+abap+online+classes In PDF document text
    • https://cdn.sqhk.co/xubulozirod/9ghibic/29981135231.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/dhbajgz/wobixed.pdfIn PDF document text
    • https://mogobuzuxoxede.weebly.com/uploads/1/3/0/7/130740257/2c05ab482f.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/jILshaH/90918074143.pdfIn PDF document text
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/9827493.pdfIn PDF document text
    • https://zimuvudiredefux.weebly.com/uploads/1/3/2/7/132710782/9872299.pdfIn PDF document text
    • https://buzowoxeferoxo.weebly.com/uploads/1/3/4/6/134662453/8891425.pdfIn PDF document text
    • https://fufarolobol.weebly.com/uploads/1/3/4/5/134597676/9d9f4740e06.pdfIn PDF document text
    • https://xopapukewude.weebly.com/uploads/1/3/1/4/131408664/8980390.pdfIn PDF document text
    • https://jomufoxubibad.weebly.com/uploads/1/3/1/1/131164047/dezutuvaduw-xafimap.pdfIn PDF document text
    • https://natevifenug.weebly.com/uploads/1/3/5/9/135986161/6645726.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/hsjiihc/lumepunorexaridomiminik.pdfIn PDF document text
    • https://mazaxijav.weebly.com/uploads/1/3/4/4/134488449/forijudozojivet.pdfIn PDF document text
    • http://winoraama.website/repuestos_de_silla_de_ruedas_invacar9gh0f.pdfIn PDF document text
    • http://qrettalq.online/grandparents_in_spanish_language0x59w.pdfIn PDF document text
    • https://zoninezazazi.weebly.com/uploads/1/3/1/0/131070362/xubigonor-vimaza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000107ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 5076 bytes
SHA-256: 8801fb1825b186173bc048320d9c0e9659c2837aa38b7c46658b12a00378b0ff
font_01_sfnt_off00011908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11908 11080 bytes
SHA-256: 2fda9a6c2dfbb7476b6565fcd15a06d3b1d8a02d40a71ea12822145791190a8b

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