Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f747bde0590f253…

MALICIOUS

PDF

76.5 KB Created: 2021-03-15 08:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82241e9e430be2de7534c235ba11187b SHA-1: 40a6491d8a79c8ae5e796aa9f627df4ad299f6f8 SHA-256: 6f747bde0590f2533abe7525a6676bdb1a366689f85b108bf88375af58220255
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it contains a large number of external links, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of multiple external URLs, including those hosted on `cdn.sqhk.co`, points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=spectrum+business+smtp+settings
    • https://cdn.sqhk.co/vavewiminiv/ggbjh3k/nunirexeju.pdf
    • http://yildirimotobursa.com/piano_sheet_music_for_hallelujah_leonard_cohen_free7rr1n.pdf
    • https://cdn.sqhk.co/vumuwuxa/qggichf/wunderlist_to-_do_list_tasks.pdf
    • https://cdn.sqhk.co/lukapokobejo/jiieih2/14805216196.pdf
    • https://cdn.sqhk.co/gaxumisi/SKNba3T/happy_glass_lexington_ky.pdf
    • https://bipesulevawitod.weebly.com/uploads/1/3/1/4/131437914/8189343.pdf
    • https://cdn.sqhk.co/nemisova/GGYRFge/big_bang_evolution_mod_apk_1._1._64.pdf
    • https://cdn.sqhk.co/vozeseseber/gjiichj/tie_dye_android_wallpapers.pdf
    • https://cdn.sqhk.co/bexefoboxevi/geJicXK/27762671145.pdf
    • http://vostokzapad.su/tutadimoufrbt.pdf
    • https://cdn.sqhk.co/butuxolevu/uehdxEL/save_the_mother_earth_drawing.pdf
    • https://cdn.sqhk.co/zabitokepum/mWLxhdw/nowufu.pdf
    • http://milanbeachs.space/lotr_return_of_the_king_directors_cut_lengthvrgdx.pdf
    • https://cdn.sqhk.co/koxuzofu/itiiAhj/wekadumekufi.pdf
    • https://pelabinal.weebly.com/uploads/1/3/1/3/131379552/632027.pdf
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/fetunijo.pdf
    • https://cdn.sqhk.co/wokowuvawuz/m8O45qS/2334983044.pdf
    • https://cdn.sqhk.co/vekuniruf/ibjd1j1/9557342531.pdf
    • https://cdn.sqhk.co/zivupowixede/gKOhdTL/foryoupage_on_tiktok_meaning.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_5333d9aad23841349ab884a515a1a217.pdf?index=true
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_f1be21f572e04cb9b2966c5c5dad8874.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c1.bin
76f8433e08166c6053c1da9e07296bdff5a8f795bac6652640a9e5574e2bc6a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 5252 bytes
font_01_sfnt_off0000f57b.bin
246569b5fd7226bd0ebf3c016de7ba0bf82e996896d660a08030b2af0a08efd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 1936 bytes
font_02_sfnt_off0000febc.bin
c67ab0a4223744b59142eacc1fafdc022102ffb0514c0061acc6f802d2f0554f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBC 10936 bytes

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