Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a92b63029dc4c81…

MALICIOUS

PDF

60.0 KB Created: 2020-11-23 04:12:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8e96a71f7a8fa246467434ead73d3fb SHA-1: 55d655c1c198c2832a18a010ef98bf0ab1aabf9a SHA-256: 7a92b63029dc4c8115925ac1eb101d6d7f85a6f68cc3b707ca355579cde6261b
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafffi.ru/123?utm_term=74+centimeters+to+inches+and+feet
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5fa33639130dc.pdf
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/lolabigikika.pdf
    • https://fexifeter.weebly.com/uploads/1/3/4/6/134612515/7086585.pdf
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/gifemejir.pdf
    • https://cdn-cms.f-static.net/uploads/4446390/normal_5fb73d9e6b5d4.pdf
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/sarupavagujadobunut.pdf
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5fb91c87b5e80.pdf
    • https://wuvepadin.weebly.com/uploads/1/3/4/7/134714831/b4d304253b140.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sitok/vanewagos.pdf
    • https://uploads.strikinglycdn.com/files/2b1418c0-80c1-41ef-90a1-83a1f04785f5/2157332081.pdf
    • https://uploads.strikinglycdn.com/files/a3a0bc94-4696-419f-9103-83e0f8ee13a9/medijofubopisofedubitiki.pdf
    • https://uploads.strikinglycdn.com/files/4ec22f9f-dc62-46db-8de1-f1ee788abb57/wulitikirafetituvudipot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a77e.bin
c469c393e94dd7dcb509142e277bd5eb8eaeb6373f0437d6e621806cfb3b5c8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA77E 5088 bytes
font_01_sfnt_off0000b88d.bin
8493fb13a8b2ffab4655187a19daeae5e277153d55a887d6d5b262606cb3d2ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB88D 8504 bytes
font_02_sfnt_off0000d579.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD579 4324 bytes

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