Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dff771420423469…

MALICIOUS

PDF

68.4 KB Created: 2020-11-25 02:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfb7224370cdac8cc80039c132af418e SHA-1: 5bb6e1786be0e16026cf51ab7136445cdd7ea3ce SHA-256: 4dff771420423469bf92b3f519337edd723f86cd4f43f6f196c06a605c8b33e6
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'trafffi.ru', which is likely part of a phishing campaign. The document body, though heavily obfuscated, contains text related to 'solve for x problems' and authoring information from wkhtmltopdf, suggesting a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/strik?utm_term=solve+for+x+problems
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f87449b890b7.pdf
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f87eea8d457f.pdf
    • https://cdn-cms.f-static.net/uploads/4463543/normal_5fad256a904e8.pdf
    • https://cdn-cms.f-static.net/uploads/4370985/normal_5fa09f5bb4ac7.pdf
    • https://cdn-cms.f-static.net/uploads/4410416/normal_5fa98f7d96c75.pdf
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5fb41ea14773c.pdf
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f8c6fa03f832.pdf
    • https://cdn-cms.f-static.net/uploads/4390642/normal_5f97da55c3095.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gorajikunobixi/word_for_giving_power.pdf
    • https://uploads.strikinglycdn.com/files/9d6321fc-b99b-46be-a9d3-bb6255e25d83/fagubitinepexamopojumif.pdf
    • https://s3.amazonaws.com/xanofamaja/lasonirip.pdf
    • https://uploads.strikinglycdn.com/files/352628d9-af12-4111-9a52-789c7ee2e13d/jikujavixemepajuvutaj.pdf
    • https://uploads.strikinglycdn.com/files/56b886e1-597f-4157-a747-e8811c9ba6ec/77490189747.pdf
    • https://s3.amazonaws.com/sepawi/17512972275.pdf
    • https://s3.amazonaws.com/lixisariwulo/35666516426.pdf
    • https://uploads.strikinglycdn.com/files/2ae04df9-ad50-4f47-829d-a95a03b659dc/guwesikarixafejisejuwelu.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_off0000cf3c.bin
1796b3afa072b2a3417c1dad4fbb4036a6332a53636dedc695b7bdebe59910a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3C 5208 bytes
font_01_sfnt_off0000e0e7.bin
c2918e5bbc4909f54fc3e6ea55b3df0e8bf1b273444411fa347ec59957e5792a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 10540 bytes