Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83cbdfe3ff70269…

MALICIOUS

PDF

72.6 KB Created: 2021-01-13 02:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: eb5152cd67df740ca58bdf774e5c9869 SHA-1: ef234bf83a87dd245518800703fc304720a9bbd1 SHA-256: b83cbdfe3ff70269ed21817507c2787dcf1cee9af0ac17c9b9ec3d49efa97b27
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged for containing malicious redirector links and acting as a link farm. The document contains numerous URLs pointing to external PDFs hosted on disposable domains, suggesting a tactic to manipulate search engine results or distribute further malicious content. The presence of a redirector URL indicates an attempt to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffmen.ru/aws?utm_term=after+effects+text+projects+free In PDF document text
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/dufikul.pdfIn PDF document text
    • https://demavagof.weebly.com/uploads/1/3/4/0/134017100/lewolu_mokakinupusorib.pdfIn PDF document text
    • https://xogazusuguse.weebly.com/uploads/1/3/4/4/134479670/pabunapope.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/WK3P0M7/mofexoxav.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/gzgdge0/nuvilegakokivigof.pdfIn PDF document text
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/785419b703c.pdfIn PDF document text
    • https://site-1175287.mozfiles.com/files/1175287/2xl_mx_offroad_mod_apk_data.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/xobupizir_vikotazedezelo_bawul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_5fbe1f4776e36.pdfIn PDF document text
    • https://site-1221887.mozfiles.com/files/1221887/nabepo.pdfIn PDF document text
    • https://nefatalij.weebly.com/uploads/1/3/2/7/132740339/sosejenixej_jilajuz_pebaderakuriw_mobow.pdfIn PDF document text
    • https://site-1171487.mozfiles.com/files/1171487/5766367604.pdfIn PDF document text
    • https://site-1176410.mozfiles.com/files/1176410/mod_hack_pk_xd.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_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 4900 bytes
SHA-256: 474537dced92b909b5b2ef30df9ee2ca698584968b311467ee2804e5f48919a4
font_01_sfnt_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 10760 bytes
SHA-256: 48a425d9cd205481d8540b02845d8934e355e352c693694ef14f4d5a44d0009b

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