Malicious PDF — malware analysis report

Static analysis result for SHA-256 2279f5e5603e140e…

MALICIOUS

PDF

73.5 KB Created: 2021-01-16 15:05:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2bb9286ceadffd432608f069b461300 SHA-1: d695c24f3eb36c43889a78e2c34935afdcdce0b3 SHA-256: 2279f5e5603e140e3b43a7ef0a41b4eb729f2fd038d4087250166bd8d28f8487
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to 'Casualty loss form irs' and is associated with the URL 'https://traffine.ru/aws?utm_term=casualty+loss+form+irs', suggesting a phishing attempt to trick users into believing it is an official IRS document. The presence of embedded URLs and the nature of the detection indicate a likely attempt to deliver a malicious payload or redirect the user to a phishing site.

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://traffine.ru/aws?utm_term=casualty+loss+form+irs
    • https://julogunakununu.weebly.com/uploads/1/3/2/8/132814048/6606520.pdf
    • https://padubutidosose.weebly.com/uploads/1/3/3/9/133997835/be5841268.pdf
    • https://static.s123-cdn-static.com/uploads/4366029/normal_5ff8f8d8427a3.pdf
    • https://gugeropufil.weebly.com/uploads/1/3/0/8/130874104/4922025.pdf
    • https://cdn-cms.f-static.net/uploads/4453902/normal_5fa46e383aa47.pdf
    • https://cdn-cms.f-static.net/uploads/4379616/normal_5fa189361151b.pdf
    • https://site-1178383.mozfiles.com/files/1178383/echo_voice_recorder_app_for_iphone.pdf
    • https://gugeropufil.weebly.com/uploads/1/3/0/8/130874104/8546663.pdf
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/lojevimuwukowi_pakodiv_fajoniparud.pdf
    • https://cdn-cms.f-static.net/uploads/4448733/normal_5fb257ff3a0cd.pdf
    • https://static.s123-cdn-static.com/uploads/4382784/normal_5fc87acc910d8.pdf
    • https://cdn-cms.f-static.net/uploads/4385012/normal_5f961622ace51.pdf
    • https://cdn-cms.f-static.net/uploads/4411701/normal_5f98b23773724.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e5a5.bin
c40a576afed2a1a130f0a6c9d562f860b6b3d320cfbfe1d33747d216a4786f44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 4920 bytes
font_01_sfnt_off0000f654.bin
0c42804d1a08f8caa3f97576c0791e91df0cf2244ffad823b745d9ea503c6e5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 10168 bytes

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