Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cfb5ad752ffcea…

MALICIOUS

PDF

69.6 KB Created: 2020-12-18 21:31:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ab952544d47f4ed24e63b36e652cd68 SHA-1: 1b6b95ef50c401900b123e2fa86c2cee82230f78 SHA-256: d9cfb5ad752ffcea1f4514a64b1df090750ab0bde90654f1fc99e1a99b827c9a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious sites, as suggested by the PDF_SEO_LINK_FARM heuristic. The primary malicious URL identified is https://trafffi.ru/123?utm_term=mobile+legends+cheat+engine, which appears to be a lure for users searching for game cheats.

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://trafffi.ru/123?utm_term=mobile+legends+cheat+engine
    • https://xuzelete.weebly.com/uploads/1/3/2/6/132681171/vutexenime.pdf
    • https://pudesuvake.weebly.com/uploads/1/3/0/9/130969082/9942352.pdf
    • https://gabesusot.weebly.com/uploads/1/3/4/8/134895193/sibemaludutanan-demininutepiw-zilavo.pdf
    • https://lolidinol.weebly.com/uploads/1/3/4/8/134884516/kixamaxizajis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d353164f-df29-410d-8f4b-2e5eec894db4/33542871510.pdf
    • https://uploads.strikinglycdn.com/files/90a99025-65ae-4ada-9558-b7e097904a64/wca_cheerleading_competition.pdf
    • https://uploads.strikinglycdn.com/files/53b5966b-0aa0-4110-935f-1ede5e1550ec/fivumexipibu.pdf
    • https://uploads.strikinglycdn.com/files/9ca1111d-f01d-4ef5-8d71-6d0194dfe130/torrent_no_peers.pdf
    • https://uploads.strikinglycdn.com/files/9088cd76-63a5-4382-8211-201e7d103424/montgomery_ward_catalog_1895.pdf
    • https://uploads.strikinglycdn.com/files/fda888a3-a5e4-4e35-aa9a-06ba89c12e30/femeluwewu.pdf
    • https://uploads.strikinglycdn.com/files/01066b3d-1a92-411d-9259-53fae88ce971/66455162800.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_off0000c6b9.bin
e212f82a07800412614dcaa3c18bafcb5a61f3a61c464a2dcdcecd0b481c3799
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B9 5040 bytes
font_01_sfnt_off0000d7d4.bin
99eaba3182bfbb7d3c94188af7c859e57e50bd4cdd0c45af212e856235021bcc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 10444 bytes
font_02_sfnt_off0000fb9e.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 4324 bytes