Malicious PDF — malware analysis report

Static analysis result for SHA-256 186b69df2fa161be…

MALICIOUS

PDF

67.9 KB Created: 2020-12-29 20:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e982015710257ffcd695ec6d7b31f789 SHA-1: 5d0b1e76b1dea5e54911026476f53e164d3b73a8 SHA-256: 186b69df2fa161be31e035731a3dedc261e762d75723f8b2fb1a4e1afc686646
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a resource that appears to be a lure for installing an APK, suggesting a phishing or malware distribution attack. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'install apk as system app', reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffset.ru/123?utm_term=install+apk+as+system+app
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f8960745dae1.pdf
    • https://cdn-cms.f-static.net/uploads/4481852/normal_5fb596ac17af9.pdf
    • https://cdn.sqhk.co/juxerawabuf/0JOgfij/general_cable_conduit_fill_calculator.pdf
    • https://cdn-cms.f-static.net/uploads/4427498/normal_5fa57fc476443.pdf
    • https://static.s123-cdn-static.com/uploads/4489402/normal_5fdf2a1a93701.pdf
    • https://cdn.sqhk.co/lawafopugu/UxQjQc3/hd_movies_free_download_sites_for_pc.pdf
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/bomukewunev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/remuv/crusader_quest_weapon_guide.pdf
    • https://s3.amazonaws.com/fopalew/josikakewusajamozuxo.pdf
    • https://s3.amazonaws.com/xeropizuwe/67213420054.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_off0000cfd4.bin
53400d239b5d2c91879926e1a7ed6c9e710f1a201fd26bfd927989e605343767		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD4 4972 bytes
font_01_sfnt_off0000e0ba.bin
f338abfad3a34f67663422d54eb0695c5a9f1ae423938eae33664a51e09feace		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BA 10168 bytes

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