Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b3eadc79f589f0…

MALICIOUS

PDF

79.1 KB Created: 2021-04-05 21:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 016b865ce96ad173fa028a27c1c93e55 SHA-1: d17abc52877062ff950a968855ac1e04774decf8 SHA-256: a5b3eadc79f589f0124c9e15d137a3e6a3270c054369ee5f3d27a89f9ad4164c
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 URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a specific medical condition to entice users to click the link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/award?keyword=ataxia+espinocerebelosa+tipo+10+pdf
    • https://cdn-cms.f-static.net/uploads/4443357/normal_604221fc46bd6.pdf
    • https://static.s123-cdn-static.com/uploads/4487424/normal_6006afc5010a6.pdf
    • https://cdn.sqhk.co/gogefaman/eK5WZO3/widonutazufatumanejud.pdf
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fe08a9a0ee32.pdf
    • https://cdn-cms.f-static.net/uploads/4493200/normal_6036fd0f9d9d0.pdf
    • http://jotetifijenosif.iblogger.org/45611198559.pdf
    • https://static.s123-cdn-static.com/uploads/4381971/normal_5fe59645388f6.pdf
    • https://cdn-cms.f-static.net/uploads/4413238/normal_600ede36ae476.pdf
    • https://static.s123-cdn-static.com/uploads/4455176/normal_5fc70cc5e0c00.pdf
    • https://static.s123-cdn-static.com/uploads/4385435/normal_5fe234ea634cf.pdf
    • http://fovagenifozemub.iblogger.org/nimaxovunoxedelifafepowu.pdf
    • https://cdn-cms.f-static.net/uploads/4474723/normal_6014c484a9717.pdf
    • https://cdn-cms.f-static.net/uploads/4446789/normal_60210f704dbb6.pdf
    • https://cdn.sqhk.co/mewivupa/DxDgfib/linkin_park_reanimation_full_album_download.pdf
    • https://static.s123-cdn-static.com/uploads/4451755/normal_5fc791551c29c.pdf
    • https://cdn-cms.f-static.net/uploads/4375080/normal_6023c7d5e1be7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_29b434f4047747869d252a8808990dd8.pdf?index=true
    • http://merixokove.rf.gd/vatifijalazibibuwi.pdf
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_ba620a153c314d5cbf4134a0ac37d665.pdf?index=true
    • http://jofisakukobi.rf.gd/example_of_bibliographic_essay.pdf
    • http://sonazawokog.rf.gd/11406222257.pdf
    • https://2d66045e-c276-4037-81df-184b25840e97.filesusr.com/ugd/cdf3e3_2acb90590dad4d48b3c3eb58d7fd1cee.pdf?index=true
    • https://e2685184-9bcc-4d63-b126-5f7cf6655de3.filesusr.com/ugd/267f13_c78aa354eab94c8b954ae8a6ed78f16a.pdf?index=true
    • 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_off0000ea49.bin
1e069598696304791ce5f1b68250d32a97273f70c60d097f7dd1a8ee8cbcce08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 5328 bytes
font_01_sfnt_off0000fc64.bin
899177f8081d184587f26717302738b3be31231083720d98dc9bb808388d6716		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 10712 bytes
font_02_sfnt_off000120db.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 4324 bytes

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