Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d1769052c84393…

MALICIOUS

PDF

101.4 KB Created: 2021-01-21 22:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7472bd1edcd829f1bbe488de7ad30fb9 SHA-1: ee4acab7777142db9231f5f38722a1fd318cc1df SHA-256: 18d1769052c84393f041d31a80c8fc01b500dcc8dda6b60cb4e10be8da786a1f
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple external URIs, including one pointing to 'maypoin.ru', disguised as a search result. The document body is heavily obfuscated, but the presence of external links and the heuristic firings strongly suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=wiki+game+of+thrones+season+5
    • https://cdn.sqhk.co/vapelomusanu/xCoibpx/3689888492.pdf
    • https://cdn.sqhk.co/goluxewimabu/QNZicjd/sevuguxaxibakef.pdf
    • https://cdn.sqhk.co/rapowipijes/jsigAAJ/21506405522.pdf
    • https://site-1179856.mozfiles.com/files/1179856/ww2_battle_simulator_mod_apk_rexdl.pdf
    • https://zudomizat.weebly.com/uploads/1/3/5/3/135308615/84d2053d43b9a.pdf
    • https://site-1174183.mozfiles.com/files/1174183/fortnite_faze_kaz_trickshot_course_code_3__0.pdf
    • https://pusobufuronuwu.weebly.com/uploads/1/3/4/4/134475569/pogupazedemok.pdf
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/dodaven.pdf
    • https://cdn.sqhk.co/gotakavapu/jiymhe8/devejeronuvor.pdf
    • https://site-1171661.mozfiles.com/files/1171661/no_man_s_sky_beyond_vr_review.pdf
    • https://goguribepolim.weebly.com/uploads/1/3/0/7/130739596/dogozidomivizop.pdf
    • https://site-1198415.mozfiles.com/files/1198415/95705927537.pdf
    • https://site-1178650.mozfiles.com/files/1178650/zenefobuziba.pdf
    • https://nitetawowi.weebly.com/uploads/1/3/5/3/135301411/xajuvozepi-rebasodukid-rexazexibuvu-fubenevabal.pdf
    • https://site-1168045.mozfiles.com/files/1168045/poreze.pdf
    • https://linabodaku.weebly.com/uploads/1/3/1/1/131164293/bowujuvez.pdf
    • https://batuginuvitewaw.weebly.com/uploads/1/3/4/0/134013132/dewokepizuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wiwekire.epizy.com/business_development_assistant_job_description_template.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_off00014f4b.bin
d9d874e7c2aa029bac6a24c881ffa1b2dc307c0371f5b696e49244e216b575c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4B 5348 bytes
font_01_sfnt_off0001616d.bin
cf24f1da3e2f6f4bdd58077b1f8893a1cbe017b65395e938508abb8470eb0827		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1616D 11924 bytes

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