Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ec36bd3c348e51…

MALICIOUS

PDF

72.3 KB Created: 2021-06-06 02:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bb562d8b0db968441acab37ab61ddea SHA-1: 94da8d0441905ed1c2b5091e48e36efc6e80c64a SHA-256: a6ec36bd3c348e513f915b2eb5b2541640ff499a7685205201cde0a97458ecbd
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains an embedded URL. The document body, though heavily obfuscated, suggests a lure related to IELTS exam preparation. The embedded URL likely leads to a phishing or malicious 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://huntic.ru/pbw?utm_term=ielts+upgrade+8+reading+test+3+answers
    • https://cdn-cms.f-static.net/uploads/4465259/normal_605c68ee5b195.pdf
    • https://static.s123-cdn-static.com/uploads/4467561/normal_5feeb3c829b16.pdf
    • https://cdn-cms.f-static.net/uploads/4451941/normal_6035746be8197.pdf
    • https://cdn-cms.f-static.net/uploads/4391000/normal_603c055e969ed.pdf
    • https://cdn-cms.f-static.net/uploads/4461748/normal_6023cfaaf3032.pdf
    • https://wezoduvum.weebly.com/uploads/1/3/4/0/134096245/4347d8578e.pdf
    • https://basipavegisu.weebly.com/uploads/1/3/4/3/134390368/narimalenuguxorilit.pdf
    • https://gipomezaligivuj.weebly.com/uploads/1/3/5/3/135348854/e3b462f75.pdf
    • https://kazilapematif.weebly.com/uploads/1/3/5/2/135293457/zidopizepetoze.pdf
    • https://toruvorunivigu.weebly.com/uploads/1/3/5/3/135317855/wokekoxoref.pdf
    • https://cdn-cms.f-static.net/uploads/4451551/normal_60641d664bd69.pdf
    • https://cdn-cms.f-static.net/uploads/4450042/normal_601de70625770.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d208e16c-5097-499c-9810-70eece3a6924/15641076558.pdf
    • https://uploads.strikinglycdn.com/files/61d6a852-5c9b-452c-bdb4-2284826a1cf0/sodalomazujelupexaxegat.pdf
    • https://uploads.strikinglycdn.com/files/de209d00-17a2-4b3a-b0fd-8b09c00748d2/desifopozijalijugarug.pdf
    • https://uploads.strikinglycdn.com/files/245d4756-5a56-4a4e-8b3e-69d8167fb522/linear_equations_practice_100_problems_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/d266b2e0-169d-4c46-8ab4-fee059b54f80/pojosevufe.pdf
    • https://uploads.strikinglycdn.com/files/24563b7e-f598-4879-9ed2-f33f4440735b/zemasotemuzaxuv.pdf
    • https://uploads.strikinglycdn.com/files/3dce9d2c-13c0-4123-8cce-22481fd9b6f4/dell_inspiron_570_motherboard.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_off0000df2a.bin
b43e9da92ac162b1540b7be97b62360ad741eaf2ce68bfc2a68bebce1a12e5db
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 5516 bytes
font_01_sfnt_off0000f206.bin
c2042844f865ada1f89afe7ed62484f8633bf397af5554b629015771cec70b7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 9988 bytes