Malicious PDF — malware analysis report

Static analysis result for SHA-256 6423e195533e4447…

MALICIOUS

PDF

75.8 KB Created: 2021-03-07 15:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f6638d153216426b69d32f43924b256 SHA-1: 74c574c53f3b6a5254bf3d10d2dc2c1e0e189bf7 SHA-256: 6423e195533e444796e0fd3574f22429de3f289f05e2e0d3436c20c8b2a2f4f5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to harmful content.

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://midufefew.ru/wix?keyword=amsco+apush+answer+key+pdf
    • https://static.s123-cdn-static.com/uploads/4495271/normal_60039c3752f1e.pdf
    • http://zatutajijiti.getenjoyment.net/41992046933.pdf
    • https://cdn.sqhk.co/livulopo/nIUjhRp/40986190078.pdf
    • https://cdn.sqhk.co/bovutolomevo/oYhdcFp/reflex_test_for_gamers.pdf
    • http://rijewomel.scienceontheweb.net/what_does_it_mean_when_first_alert_blinks_red.pdf
    • https://static.s123-cdn-static.com/uploads/4375209/normal_5fdd336d78b34.pdf
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/8489985.pdf
    • https://fenanenu.weebly.com/uploads/1/3/4/2/134265689/9e88bcf5631bc.pdf
    • http://wemuwetafivaxe.sportsontheweb.net/43504636075.pdf
    • https://cdn.sqhk.co/kigaratak/aKidgzO/23262774762.pdf
    • https://cdn.sqhk.co/nejibija/hWjjgda/zizapimuzurijupusiluzet.pdf
    • https://cdn.sqhk.co/rudixika/heiGggw/call_of_sniper_war_mod_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wurivuve/arduino_software_free_for_windows_10.pdf
    • https://s3.amazonaws.com/vatosolikijike/citizen_eco_calibre_8700_manual.pdf
    • https://s3.amazonaws.com/zemunomipazikez/hyrule_warriors_guide_legend_mode.pdf
    • https://s3.amazonaws.com/zozofufulolig/jetapurebofene.pdf
    • https://s3.amazonaws.com/buxoparadazegu/holy_bible_nkjv.pdf
    • https://s3.amazonaws.com/pibajuwi/15187406528.pdf
    • https://s3.amazonaws.com/bubodeliza/samsung_s8_wallpaper_hd_1080p.pdf
    • http://makakanow.onlinewebshop.net/jotazozofokonabebaj.pdf
    • https://s3.amazonaws.com/makixibawumebol/losartan_recall_list.pdf
    • https://s3.amazonaws.com/pezofut/masejonejife.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_off0000ea39.bin
3412731bb012436677491e2911e79c89d784de46fb310dada7c79122685d8781		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 5612 bytes
font_01_sfnt_off0000fd3e.bin
4adcaf875c613237ebc5c016b7531d0b057ae86e4516a050bbec64ba829b4168		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 10792 bytes

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