Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cfb99e2acbeac77…

MALICIOUS

PDF

77.0 KB Created: 2021-03-30 11:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01e7d8b918cb6380e1464ed61b161138 SHA-1: 71f05b22ef776568d484539caa30ba76a231e1dd SHA-256: 2cfb99e2acbeac771aa9db7eb02428bd918f207e577c397c41401d9c4d9dd9ca
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, `maypoin.ru`, which is presented as a link for an 'English speaking course pdf in urdu'. This suggests a phishing or social engineering attack aiming to trick the user into visiting a malicious site. No scripts were extracted, but the PDF structure and embedded URI are strong indicators of malicious intent.

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://maypoin.ru/award?keyword=english+speaking+course+pdf+in+urdu
    • http://hotloveme.online/19330634625rsyah.pdf
    • https://cdn-cms.f-static.net/uploads/4369190/normal_60516883afd10.pdf
    • http://50off.pro/saftirik_greg_in_gnl_full_izleib139.pdf
    • http://lidzadva.xyz/57720114507abv8q.pdf
    • https://cdn-cms.f-static.net/uploads/4489596/normal_603056c0412b5.pdf
    • https://cdn-cms.f-static.net/uploads/4459470/normal_603e58ee22070.pdf
    • http://wdd13.ru/japuko6hsuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tosevud/3854361260.pdf
    • https://s3.amazonaws.com/fasudikek/91876627877.pdf
    • https://s3.amazonaws.com/kibavutibeved/caravaneer_2_free.pdf
    • https://s3.amazonaws.com/xaliwalufoguni/apocalypse_world_war_ii.pdf
    • https://s3.amazonaws.com/zulezov/black_and_decker_20v_trimmer.pdf
    • https://s3.amazonaws.com/nisoxow/63674559012.pdf
    • https://s3.amazonaws.com/faxaxos/wadod.pdf
    • https://s3.amazonaws.com/vovopafubipu/50053334212.pdf
    • https://s3.amazonaws.com/bipovoromoj/tefifamopezisami.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_off0000ef94.bin
9d00758eda94f437ab98822d4b1cc5eaa86de2fcb7dc836398ab356ea7fc20c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 5436 bytes
font_01_sfnt_off00010212.bin
f4a86fa61645977812918308d8cba1897a1e4c47d5582c6c2e746c2639a3048a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 10836 bytes

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