Malicious PDF — malware analysis report

Static analysis result for SHA-256 5711706475517c9c…

MALICIOUS

PDF

182.7 KB Created: 2020-11-24 07:51:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a00dae86e1c19a4dd7a10fa7b9ed61a SHA-1: 770865a45983733cc735998a3eb54735fc0b28d3 SHA-256: 5711706475517c9cccd836644326951e7417c20cc57a56d9b934cd550d9604f9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of many external URIs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://traffset.ru/123?utm_term=gw2+warrior+guide+2019
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/rewasuwapuja.pdf
    • https://goraworozegisu.weebly.com/uploads/1/3/4/3/134324811/tazevudafifo.pdf
    • https://vureduvo.weebly.com/uploads/1/3/4/5/134513064/c6fd37f38.pdf
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5f875ca5d3ec9.pdf
    • https://tozugijojabam.weebly.com/uploads/1/3/4/6/134640227/sorenow.pdf
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5fa8fb3901692.pdf
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/5ec94f.pdf
    • https://tivurenufetoza.weebly.com/uploads/1/3/4/2/134235987/6753566.pdf
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/4094919.pdf
    • https://vebusigatibata.weebly.com/uploads/1/3/4/3/134321359/48d834f39491.pdf
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/c9383076648f229.pdf
    • https://cdn-cms.f-static.net/uploads/4473651/normal_5faf124179330.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a9262a42-1816-4d22-8940-e07069a912c9/nelson_denny_reading_test_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/6fb1ae70-a856-4cd8-b748-73d309050b0e/the_weepy_voiced_killer.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_off00029468.bin
1c57d30de30d478e5cd77aba5cf73b88a7264dd075dfa34bbac8d9a0aab6fb2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x29468 5388 bytes
font_01_sfnt_off0002a6e4.bin
4326b1375ff092b0d8ca20152040b612bc63ce660fb88af11172fa9fdd68ebdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2A6E4 11404 bytes

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