Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0088e2edec32e27…

MALICIOUS

PDF

75.9 KB Created: 2021-06-09 12:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8185c4aa85de793c7fad0a028a7b67c SHA-1: 7aa65da98d566d2ccadb447251b582eff9e9083f SHA-256: e0088e2edec32e27887cd40c97e88eae097005fd3f925b57c5e72ca6ed3ecc60
126 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 numerous external URIs, with one prominent URL pointing to 'https://medvor.ru/pbw?utm_term=ark+mod+download+pc', suggesting a lure to download content. The document body, though heavily obfuscated, contains references to 'ark mod download pc', reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/pbw?utm_term=ark+mod+download+pc
    • https://cdn-cms.f-static.net/uploads/4371025/normal_605fb49a22055.pdf
    • https://fewugoxozo.weebly.com/uploads/1/3/4/4/134441687/somosavix.pdf
    • https://vosegatibi.weebly.com/uploads/1/3/4/6/134697540/00f654e9c73c6ae.pdf
    • https://papobujiwirila.weebly.com/uploads/1/3/1/4/131453114/363ab15.pdf
    • https://cdn-cms.f-static.net/uploads/4454965/normal_60397f1c9b192.pdf
    • https://lobuponumabezi.weebly.com/uploads/1/3/4/5/134508668/95463fdcd1a782c.pdf
    • https://static.s123-cdn-static.com/uploads/4418747/normal_5ff2578fc66bc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jobagej.pbworks.com/w/file/fetch/144777174/dnd_5e_hexblade_guide.pdf
    • http://guronavageba.pbworks.com/w/file/fetch/144507555/tezurigemegeraburum.pdf
    • http://sekodegaxex.pbworks.com/w/file/fetch/144907203/supimupozalodudekolu.pdf
    • http://barumena.pbworks.com/f/jlpt_n4_kanji_practice_sheets.pdf
    • http://zolunegoli.pbworks.com/f/firefox_android_proxy_settings.pdf
    • http://bupataved.pbworks.com/f/15195912281.pdf
    • http://ravaxes.pbworks.com/f/mrit_sanjeevani_mantra_download.pdf
    • http://redelaw.pbworks.com/w/file/fetch/144535719/javascript_e_jquery_jon_duckett.pdf
    • https://uploads.strikinglycdn.com/files/f1a7f03c-0333-486d-9875-faa78b127c68/61022028550.pdf
    • http://wixugigir.pbworks.com/f/17441492685.pdf
    • http://sisagexal.pbworks.com/w/file/fetch/144882594/school_audit_balance_sheet_format.pdf
    • https://uploads.strikinglycdn.com/files/16d231ff-0ccc-4b99-ab3d-0aa233ad5b03/secrets_of_the_baby_whisperer_espaol.pdf
    • https://uploads.strikinglycdn.com/files/c5a4b02e-2f99-4bc7-b31f-34048caac812/gimuxobozuzirigedinike.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_off0000de85.bin
6d2092e9051ea9e922027ac2c39d2182f607d7a6bbb93d6a668cbc5fcd94cba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 5184 bytes
font_01_sfnt_off0000f027.bin
a26629ea3a5c984b49310443374c48b42b58b49417662d054ee797d173fa8fa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 22492 bytes

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