Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3af4e3eb3a5279…

MALICIOUS

PDF

81.3 KB Created: 2021-02-14 21:30:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 52660bb9dc885c26c28e15ff58350ef2 SHA-1: 3a2db6fc5981904b870a108ac84212cb670e147b SHA-256: 8f3af4e3eb3a5279a3fe03c48851ba505e83cde92e35f4dec3a52c46c6aab088
272 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on disposable domains and flagged as part of a link farm. The presence of a malicious redirector link and ClamAV detection strongly suggests malicious intent, likely phishing or malware distribution. The document body's garbled content and the heuristic 'SE_INVOICE_LURE' indicate a deceptive lure to encourage users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crophysi.ru/wix?keyword=milled+ak+bullet+guide In PDF document text
    • https://cdn.sqhk.co/futevanu/b9pWPih/turazozoneba.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/umghja9/758408033.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485828/normal_6007baa8c8950.pdfIn PDF document text
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/gewaw.pdfIn PDF document text
    • http://wepegudefagixu.iblogger.org/16177138942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_601ee62591652.pdfIn PDF document text
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/rijus_xoreba.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/d29380d232d4797.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/nhbihhc/23273668037.pdfIn PDF document text
    • https://zujetopefij.weebly.com/uploads/1/3/4/7/134766602/9c384117e84.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/hizgijh/crossword_clue_heaven_sweet_heaven.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvunemomot.epizy.com/laptop_pc_bus_games.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_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 4928 bytes
SHA-256: 672fc9df15f939230c8f23aa0e9c564776b7f7f068c925e8ee5f8280d4664aa5
font_01_sfnt_off00011278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11278 11180 bytes
SHA-256: 0280248b815127b5cc3fabecb9d2572502fbe43a523aaa4f704398e457d2d7ae

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