Malicious PDF — malware analysis report

Static analysis result for SHA-256 e010f773b54b0d51…

MALICIOUS

PDF

84.0 KB Created: 2021-03-22 18:25:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5cfc4fe708e24509de2a6b132ad80bb SHA-1: 1d246ffa37e9ac11d4e44fad644274153f983a68 SHA-256: e010f773b54b0d5160b2fd00c084b0f2462441aec97e7a0d623c0dd7cfc00bc6
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, indicating a high likelihood of malicious intent. It contains embedded URLs, with one prominent URL, 'https://soxebez.ru/award?keyword=lee+child+night+school+pdf', appearing to be a lure for a book download, which is a common phishing tactic. The PDF also contains numerous other links, some hosted on disposable domains, suggesting a link farm or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=lee+child+night+school+pdf
    • https://cdn-cms.f-static.net/uploads/4464861/normal_60415153935aa.pdf
    • http://lubevos.scienceontheweb.net/acca_f6.pdf
    • http://tigafik.mygamesonline.org/noxeruziwenimav.pdf
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5fc641d0004a6.pdf
    • https://cdn-cms.f-static.net/uploads/4475406/normal_60340acb7e778.pdf
    • https://cdn.sqhk.co/xuzuvazol/hajfxgi/super_dragon_battle.pdf
    • https://cdn-cms.f-static.net/uploads/4424007/normal_6032c7be7db12.pdf
    • https://cdn.sqhk.co/gogerazina/hjf9Ehi/beard_salon_beauty_makeovers.pdf
    • http://kirakexig.mypressonline.com/jizewibotatutobuket.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jiwerefupuz.epizy.com/48449732691.pdf
    • http://fomepufasele.atwebpages.com/aviation_english_macmillan_download.pdf
    • https://uploads.strikinglycdn.com/files/b436aaae-a7b5-4b87-b069-b1a486d25a18/how_to_day_trade_forex.pdf
    • https://uploads.strikinglycdn.com/files/e64cce9f-22bf-44b1-891b-a207e0ebe986/kenmore_he2_plus_water_not_draining.pdf
    • http://fozozip.onlinewebshop.net/us_army_field_artillery_officer_career_path.pdf
    • http://jatoxat.atwebpages.com/whirlpool_french_door_refrigerator_not_making_ice.pdf
    • http://wotawegij.rf.gd/s_p_euro_dividend_aristocrats_factsheet.pdf
    • https://uploads.strikinglycdn.com/files/8ad0ae5a-d357-4b41-82a8-c57d1be9fd51/25491563377.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_off00010c8e.bin
0cc7c1b535fe9f9852fde0ee368dafcba8888e10f6fc211bec8efbe18a1ac021		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 5052 bytes
font_01_sfnt_off00011dcc.bin
877c8f6348a2082d3d6f1d9b6dde79774cb1f485cec252debc88f3f4a2d536a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 11028 bytes

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