Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16d126da1cfd9b1…

MALICIOUS

PDF

67.4 KB Created: 2020-11-25 07:27:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d08b59dd6973b6c5275c85b324a01a8 SHA-1: 753cc97bd2fd7e4c07045419eceda09e21a2533f SHA-256: a16d126da1cfd9b1ccbc3c2cd0ade3e084e24c0c78e54c7cc8b9ebb30a027d8e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffine.ru/123?utm_term=pixel+gun+3d+cheats+online+dating
    • https://jederatikepu.weebly.com/uploads/1/3/4/3/134370591/7976957.pdf
    • https://xuvagava.weebly.com/uploads/1/3/4/8/134879605/d2f0496cb3e.pdf
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/pegikerosaso_zejututufosi_xepuzizoluboba_rasolugib.pdf
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/tinibej_losafiropi.pdf
    • https://mujiborabasovu.weebly.com/uploads/1/3/4/5/134590634/vezedoxeko.pdf
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/c593cd58690.pdf
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/e9ff54.pdf
    • https://cdn-cms.f-static.net/uploads/4422906/normal_5fa241d2e85b0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c423dba5-9962-42ff-ab22-cf191c6e61e6/16715574490.pdf
    • https://uploads.strikinglycdn.com/files/16eb0cce-ddf0-49dc-9d9b-6fcc1675fca0/15782231316.pdf
    • https://uploads.strikinglycdn.com/files/cf467258-9399-4d00-9103-360ae181ecbb/gizej.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9df.bin
d29d60883e4c047dee5bf51064df7d2ed4681a2a4cb31f283888ade964519211		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DF 5336 bytes
font_01_sfnt_off0000dc0d.bin
4b2aa3295cbf4b8bfe33a2e873a5a6980eda7372727249c6216bce3fcdbe13f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 10924 bytes

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