Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8dc4e688898060…

MALICIOUS

PDF

89.7 KB Created: 2021-04-06 12:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4d9a976f6eea11f79cb4d3edb458a7a SHA-1: d65fce33f4aa810cc9d957aaf1cf41db9d6cb888 SHA-256: ba8dc4e68889806018758119e25694ff0c1663ae890fb4cbd40754fe21ca9dc1
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'mezovuduw.ru', which is likely used to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'belajar tajwid lengkap pdf'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/award?keyword=belajar+tajwid+lengkap+pdf
    • http://gromstroy.com/412925468762kow3.pdf
    • https://static.s123-cdn-static.com/uploads/4413712/normal_6003ec09ac1ab.pdf
    • https://tunajixawovu.weebly.com/uploads/1/3/0/8/130873758/levumi_kewoludezap_mesebopaviv.pdf
    • http://bazis-rostov.com/56390650214tnd1p.pdf
    • https://cdn-cms.f-static.net/uploads/4413007/normal_6049c1421405e.pdf
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5fd242481c001.pdf
    • http://shoppingyxplus.xyz/how_to_fix_logitech_z506_speakersnpzt0.pdf
    • http://chambrehub.xyz/zosimededatajo1q5q5.pdf
    • https://cdn-cms.f-static.net/uploads/4382412/normal_6052b1bd12951.pdf
    • https://benejawu.weebly.com/uploads/1/3/4/1/134131543/wavuze.pdf
    • https://cdn-cms.f-static.net/uploads/4448984/normal_6023f796d4de0.pdf
    • https://defagetomorig.weebly.com/uploads/1/3/4/5/134576552/tasuginarevuki_gorik_falozadizo_vizulivi.pdf
    • http://study-english-02.space/fusexaravapifovisomodulimabfde.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2e68cf6d-4e33-4660-bc8b-dfcb9e599d76/55327952632.pdf
    • https://s3.amazonaws.com/ligole/rayovac_class_2_battery_charger_model_ps334.pdf
    • https://s3.amazonaws.com/tobobowu/la_crosse_technology_alarm_clock_manual.pdf
    • https://s3.amazonaws.com/xufaxoferugod/84578172333.pdf
    • https://uploads.strikinglycdn.com/files/84f661ce-fa94-470a-8bf1-2594db7fc30d/36510014505.pdf
    • https://uploads.strikinglycdn.com/files/98782996-e825-48b8-a11f-cb2ad740dd15/52967599584.pdf
    • https://s3.amazonaws.com/mulerux/tebalixasi.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012745.bin
2031ed3a1fe0f412f876b6aca0679ba60d9f7f32817e584dc716c3c321d6b7d6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12745 27608 bytes
font_00_sfnt_off0000efd1.bin
48e8736699b35d83c59f5380838c1b96b67c7edb77a119054d33ecbc5ecea02f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 5312 bytes
font_01_sfnt_off00010212.bin
fef538b4f9ebee83ae66093611d75eaa084271d69204acd24bfa66eb433163e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 11184 bytes

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