Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b9d4d2abd502ff…

MALICIOUS

PDF

85.2 KB Created: 2021-04-05 11:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b178efdeb78dee21cc6e6ae7a860503 SHA-1: 43de08c84bb729497dfaabb0f4cd41168d6a87ce SHA-256: 21b9d4d2abd502ff1baddf0db90a0f78f161ee3a842c4c937d1fa4b830db53d4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://jumiwimov.ru/award?keyword=esp8266+arduino+uno+tutorial+pdf
    • https://cdn.sqhk.co/waxipefimafa/tfidKB2/fr_legends_latest_update.pdf
    • http://cocobeautybar.ca/medscape_anesthesiologist_compensation_report_2018nqkk5.pdf
    • https://cdn.sqhk.co/linidivez/5chgCKt/the_vikings_movie.pdf
    • http://winclean-shop.space/66898460750na20l.pdf
    • http://shoppermarket.online/kumigowarefaxozewudotazsmwr.pdf
    • https://cdn.sqhk.co/gebemiwisero/CYedTgi/53608950299.pdf
    • https://cdn.sqhk.co/kezixowog/ighbUhc/vulomobovimo.pdf
    • http://otshelnik.net/the_chrysalids_audiobook_chapter_38ojh6.pdf
    • https://cdn.sqhk.co/sixatowitur/TjaRRYf/super_mario_brothers_music_sheet.pdf
    • https://cdn.sqhk.co/tinolefowi/3iduijX/minecraft_world_record_seed_1._16.pdf
    • http://jixuvofariva.iblogger.org/90983965926.pdf
    • http://nnorm-id.com/reruxumatarazz3517.pdf
    • http://beautytopshop.site/fatumadasefobul3q1s1.pdf
    • https://cdn.sqhk.co/felolavap/jgeVagB/zunurupenomesereto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_e3ec2722cd37432b9a611ba9b826e564.pdf?index=true
    • http://lazuvuvopa.epizy.com/17629056992.pdf
    • http://xuxojopi.epizy.com/anemia_pharmacology.pdf
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_6b3716ede15a42f1b0ed83b896562e28.pdf?index=true
    • http://xaderufemon.epizy.com/11608063660.pdf
    • https://a1104102-e7f7-498f-9db5-fd16eb5a1c84.filesusr.com/ugd/3f19aa_80d3a46df6954487b7c48db96f38851c.pdf?index=true
    • http://rutipozi.epizy.com/fathers_day_cards_printable_templates.pdf
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_f443383feae140f487edbb9b0aa8452d.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_off00010494.bin
355a674bb858ed255e831ecd122b9206f10a74a6a0caba5dd92a8d17b4a8877f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 5472 bytes
font_01_sfnt_off00011744.bin
961fc6fef009f913b6de51a30df636174e59820b128d90e962e9b89453f448be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 17924 bytes

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