Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2098f15809f2ee…

MALICIOUS

PDF

70.3 KB Created: 2020-12-18 00:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8c80be20c9a2aa440d31c4f2e7cfd6f SHA-1: 1250a0e5524f51bf187f34d2ecead5891c245b12 SHA-256: 8c2098f15809f2ee48903198959b04f6c84f62fc0a905d3f4ce883a7c4ded24c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One prominent external URI, 'https://trafffe.ru/123?utm_term=survival+games+unblocked+online', is flagged as suspicious. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The document body, though heavily obfuscated, contains references to 'survival games' and 'wkhtmltopdf', suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=survival+games+unblocked+online
    • https://rajofike.weebly.com/uploads/1/3/4/5/134500595/motoloxiwifi.pdf
    • https://xebagaxasu.weebly.com/uploads/1/3/4/8/134878678/wozanurezaviverop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static1.squarespace.com/static/5fc0873a11f6a4198483d0f6/t/5fc207f49d79364840d49f1b/1606551546969/mituwaboziredukirefurive.pdf
    • https://static1.squarespace.com/static/5fc29260bf71053ccb1ac1c5/t/5fd0a7df3bcf75077a872e33/1607509985206/clash_of_clans_for_windows_phone_10_download.pdf
    • https://s3.amazonaws.com/vedexajawo/roblox_gui_scripting.pdf
    • https://static1.squarespace.com/static/5fce898a111815217eb994bc/t/5fd627c596ed101a3e38cab5/1607870405874/rovukerokavirubuvefoxuref.pdf
    • https://s3.amazonaws.com/zuses/xotijumebo.pdf
    • https://static1.squarespace.com/static/5fc529855e8e827d42a99b3c/t/5fcad4c333fb14715cae7bd1/1607128266548/96617509833.pdf
    • https://uploads.strikinglycdn.com/files/e08a2155-0689-415f-90c3-d5187cabb2b9/topisaw.pdf
    • https://uploads.strikinglycdn.com/files/12ae3876-e343-4d73-b0d1-9fbd5b2f5c68/69305027631.pdf
    • https://static1.squarespace.com/static/5fc293a78ef7301f8b1b7b85/t/5fc404eae6d49a06bb0f785f/1606681835433/mk_vs_dc_sonya.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_off0000c92c.bin
f5afd4cca3908a214cce0f95832baf3bd25739525bf7da299586dc7c695ab3da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC92C 5428 bytes
font_01_sfnt_off0000db78.bin
d868b4991d59cbd3969bd38ce195da235f881902714359db6c78444206d0c736		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 10288 bytes
font_02_sfnt_off0000fec5.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 4324 bytes

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