Malicious PDF — malware analysis report

Static analysis result for SHA-256 df84f88f831b9696…

MALICIOUS

PDF

67.9 KB Created: 2020-12-11 19:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 169584a28367a60b87e2b26849209329 SHA-1: 7c00e2ad93fb04fd1d1da2817377f5c29f9d79a6 SHA-256: df84f88f831b96964a98d4a5e1a9af74aa4efe8a2b8acc136a29ec067936aa01
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to direct users to potentially malicious websites. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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=persona+4+tower+social+link+guide
    • https://cdn-cms.f-static.net/uploads/4425214/normal_5fa7068e1b51a.pdf
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/pefavabelutet.pdf
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/e49d34305051.pdf
    • https://zufakuka.weebly.com/uploads/1/3/4/3/134343409/7273029.pdf
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/4601805.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8bf9d0e7-2cf1-4b30-a1cb-d6188644c369/papa_johns_games_for_kids.pdf
    • https://uploads.strikinglycdn.com/files/58ff0c75-25a7-4ae9-9c3b-cdd4ff30548b/66136641162.pdf
    • https://uploads.strikinglycdn.com/files/853e28fb-20da-4328-bcdf-a698eabdf285/taxoxisox.pdf
    • https://static1.squarespace.com/static/5fbfe7e212facd59cea75dab/t/5fc1f197fa04221c71650bf8/1606545817758/the_weeping_woman_trailer.pdf
    • https://static1.squarespace.com/static/5fc5d30b7848ba205d3a93a9/t/5fca37ea2ae1264a039c7922/1607088106989/kidatafigofewi.pdf
    • https://uploads.strikinglycdn.com/files/34cbaeaa-abc8-40d4-8a63-d01c8332bcf9/sources_of_chinese_tradition_volume_1_download.pdf
    • https://uploads.strikinglycdn.com/files/b82ca2ef-626c-4ea6-8e5d-864d1f29e3c3/xedogunagolavukevetituso.pdf
    • https://uploads.strikinglycdn.com/files/48ce8790-e89b-43b5-91ba-75723926464c/64399431826.pdf
    • https://uploads.strikinglycdn.com/files/b567a922-3ddf-4146-a74c-4ef322206078/30320191202.pdf
    • https://uploads.strikinglycdn.com/files/daae1f18-2d1b-471e-aa8b-30cf8e1284c0/31134544040.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_off0000cc1a.bin
7d57782c61b44a434296d8e217e371106c303c534c0aaaebbc4a1fb3e477be9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1A 5352 bytes
font_01_sfnt_off0000de77.bin
c124d7666e0e1f5ee659efb8bfcfc1280826a7ea5ba07368caefdee07a4b44dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 10544 bytes

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