Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a75ad683449b9a…

MALICIOUS

PDF

90.6 KB Created: 2021-03-18 07:14:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef1184a9332689e5d6abbe20a4dcd2c2 SHA-1: 78562ae6d4ae8473bd816bd33a437942a49f284f SHA-256: 12a75ad683449b9a408a7315c2e5e8e73b1df8e0008f6767d11d645441c55651
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://kuzutuzo.ru/wix?keyword=atlas+deluxe+sewing+machine+manual, which is likely used to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=atlas+deluxe+sewing+machine+manual
    • https://cdn.sqhk.co/rogenujudita/jdiggcW/video_lyrical_video_status_maker_apk.pdf
    • https://cdn.sqhk.co/zijigemeworu/cZhaicd/espn_nba_ranking_2020.pdf
    • https://cdn.sqhk.co/mitukutowum/Tiaumia/51863402322.pdf
    • https://cdn.sqhk.co/jujadiziga/i1WVegc/17326428841.pdf
    • https://satemegozujig.weebly.com/uploads/1/3/4/4/134477909/3253684.pdf
    • https://cdn.sqhk.co/nivepudokoto/IQjgT3x/lagu_westlife_soledad_mp4.pdf
    • https://cdn.sqhk.co/galudubujuwa/hheWD79/motorcycle_riding_alaska_highway.pdf
    • https://cdn.sqhk.co/foroboreb/2oiepic/ww2_strategy_commander_conquer_frontline_tips.pdf
    • https://cdn.sqhk.co/tatudawo/dKnkdhj/higham_press_dog_show_reports.pdf
    • https://cdn.sqhk.co/fonizijodi/bUbvgie/premam_background_music_telugu.pdf
    • https://cdn.sqhk.co/wukatigubo/hcghhj9/42834311322.pdf
    • https://gulufoge.weebly.com/uploads/1/3/0/7/130776817/3980647.pdf
    • https://cdn.sqhk.co/piwuzuberaze/jb7jam4/atom_usdt_coingecko.pdf
    • https://cdn.sqhk.co/regavebike/8hgdjhR/va_dmv_special_agent_jobs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_ab85ebbc34f84d52a1d12eb65d530465.pdf?index=true
    • https://s3.amazonaws.com/tunenijexe/82635720517.pdf
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_5286fe05d6e542a090c2fceecc737266.pdf?index=true
    • https://s3.amazonaws.com/zumezeviwakiz/revinabewirakewafiwiwerur.pdf
    • https://s3.amazonaws.com/xaliwalufoguni/17734757081.pdf
    • https://s3.amazonaws.com/nuruvapozixix/siwulezalokem.pdf
    • https://s3.amazonaws.com/viboxikuz/algebraic_expression_worksheet_grade_6.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_off0001242f.bin
a5f84836d0961a084507bbb5c1cd6d77724af2fea3985b511188828c131dc227		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1242F 5408 bytes
font_01_sfnt_off00013686.bin
c1316d94488996a69aa8a0e56f4eb3c598b897acc38ec474c6b005571830a56a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13686 11356 bytes

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