Malicious PDF — malware analysis report

Static analysis result for SHA-256 236920efef3356d4…

MALICIOUS

PDF

76.9 KB Created: 2020-11-13 08:52:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa4fe461d62829de0bed397093f873c2 SHA-1: de4d970382e9cbcd65c2910d952b676e58ac131f SHA-256: 236920efef3356d4e356b8791ac5c40e95504fdfa224df7c741111d10778ce89
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffe.ru/123?utm_term=lgbt+center+hollywood+volunteer
    • https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/tuwigamefebafezonu.pdf
    • https://cdn-cms.f-static.net/uploads/4369776/normal_5f94596c5752e.pdf
    • https://duxawedi.weebly.com/uploads/1/3/4/4/134477895/2137081.pdf
    • https://zomasaxejis.weebly.com/uploads/1/3/4/3/134325580/978c3c0.pdf
    • https://vamarimorojikav.weebly.com/uploads/1/3/4/6/134640123/figelulosef.pdf
    • https://kirugalepolofaw.weebly.com/uploads/1/3/4/3/134340862/zusedet-dazaba-geseterev-gabedevovop.pdf
    • https://cdn-cms.f-static.net/uploads/4382639/normal_5f8d457420bbc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gagagakigibapo/atf_box_setup_v12._60_free.pdf
    • https://uploads.strikinglycdn.com/files/fbd47c74-94e5-463d-94f8-83609d690bda/3488083969.pdf
    • https://uploads.strikinglycdn.com/files/50459ba4-f310-4bce-b6af-217d1b9d76f8/78992441448.pdf
    • https://uploads.strikinglycdn.com/files/c9d31992-322e-49f6-a87a-51eb505361d0/filemuwogaxugodogerop.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84f.bin
1c91280eb79ffdc858b6ecd2b9b1b9121e398c569f5702dd47e27479ee3b0056		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 2968 bytes
font_01_sfnt_off0000e2f5.bin
c75c8f4db784d7afaa58f319bad5bbb7ddce83c6f13b4244b2f248ff0a65fc51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F5 4984 bytes
font_02_sfnt_off0000f3f8.bin
1fce012eb459c085a0654081a514b7a7cdb3e9661745a9992147b9f510f8f127		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 10724 bytes
font_03_sfnt_off00011896.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 4324 bytes

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