Malicious PDF — malware analysis report

Static analysis result for SHA-256 e227f18c1a645364…

MALICIOUS

PDF

93.4 KB Created: 2021-03-29 07:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c124bb6adfc994249f190b6f83e2bcf SHA-1: d9f8e571914e55cc8ad0cd4f48364cfed23d70bb SHA-256: e227f18c1a64536455eec6b06757ce7c54c2ae9869ca1a6a82624a920e76171a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it functions as a link farm. Numerous external URLs were extracted, suggesting the primary purpose is to redirect users to potentially malicious websites. The PDF structure and embedded links align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/award?keyword=vert+shock+pdf+free
    • https://cdn.sqhk.co/wugolekufo/hfohekw/soft_romantic_song_ringtone_free_download.pdf
    • https://nikovazof.weebly.com/uploads/1/3/2/6/132682709/veruvupupexojosa.pdf
    • https://cdn.sqhk.co/lojosewude/iitEjhb/nefamevavukanixid.pdf
    • https://cdn.sqhk.co/pejinijew/Ejhejeh/15465795943.pdf
    • http://yourlivehelp.com/164798318298p67d.pdf
    • https://cdn.sqhk.co/rosafipex/jMGjg0J/bingo_blitz_facebook_problems.pdf
    • https://cdn.sqhk.co/kalazirifev/jggd6ge/top_gear_hot_hatchback_challenge_full.pdf
    • http://accueilcmb.com/why_do_i_have_a_sore_spot_on_my_scalpkmugp.pdf
    • https://cdn.sqhk.co/tumowara/cpghVia/46727895118.pdf
    • http://parrrtner.xyz/womupaliryfdt.pdf
    • https://cdn.sqhk.co/rovifatira/e9vjjgf/ben_10_alien_swarm_1080p_izle.pdf
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/bezagebozof_dixor_ripiwudosubep.pdf
    • http://rabota-plus.club/free_bible_english_standard_versiond5bp0.pdf
    • https://cdn.sqhk.co/fexiseme/glhddhc/miraculous_ladybug_and_cat_noir_game_apk.pdf
    • https://babiweperes.weebly.com/uploads/1/3/5/3/135347107/1842499.pdf
    • http://freshmind.net/netgear_fast_ethernet_switch_fs108_manualwvvc5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_22d998e207e94f3c8da9b7fe6193917d.pdf?index=true
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_e4ec0ee301cf4e88bd7e995b95f8049c.pdf?index=true
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_24ef2094ffa3426b960bcd3e11056e98.pdf?index=true
    • https://0978d23c-7b87-408a-b4ab-ff16da0dae51.filesusr.com/ugd/369d68_222fcf00c9eb4523a0a135004d4b1881.pdf?index=true
    • 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_off0001306a.bin
75b0dcfb2899ce08c7f10863e779a3c214f67f2d9da8dd095c0d2c1260a17e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1306A 5032 bytes
font_01_sfnt_off0001418d.bin
f2993acef4c98603d3922293988f5dc1e361dd5c705892105da9fd6c86b7d81e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1418D 11680 bytes

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