Malicious PDF — malware analysis report

Static analysis result for SHA-256 67be599a28fd2537…

MALICIOUS

PDF

83.1 KB Created: 2021-03-16 11:21:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d870d1b102e610d8ca4b0bd24b91615b SHA-1: 3d5c796f46f5b65f563078ee7ce90db5250299e1 SHA-256: 67be599a28fd2537b051564f90acf50968bb9589ad5c0658135463286545b020
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-optimized and point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ponafet.ru/award?keyword=branchement+moteur+machine+%25C3%25A0+laver+5+fils+pdf PDF link annotation
    • https://kulegireketo.weebly.com/uploads/1/3/5/3/135325025/7784230.pdfIn PDF document text
    • https://cdn.sqhk.co/sazipuvaxiv/ifUherP/pretty_girl_shake_it_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/xaleteser/ajehd56/23115743529.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/haTiejb/music_and_arts_hours_today.pdfIn PDF document text
    • https://cdn.sqhk.co/rosivapixove/8VjcJid/kingston_city_soccer_club_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/xubodijixali/hchcmre/solarxtreme_250_led_200_watts.pdfIn PDF document text
    • https://cdn.sqhk.co/sugigevapure/Pifjigh/cctv_camera_course.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/ghhcghx/street_fighting_2_multiplayer_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/kig5hfM/best_gold_farm_wow_classic_mage.pdfIn PDF document text
    • https://nipawivas.weebly.com/uploads/1/3/2/6/132680981/76ae7611fd76d.pdfIn PDF document text
    • https://cdn.sqhk.co/bamewimoxatu/gXjfjaI/24902571971.pdfIn PDF document text
    • https://cdn.sqhk.co/gapobuzijiru/gTZn4zW/zemobo.pdfIn PDF document text
    • https://tevuluzusat.weebly.com/uploads/1/3/5/3/135397550/0588f45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lanaladu/bigamev.pdfIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/23127129948.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/flight_radar_24_apk_pure.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/after_effects_free_full_version.pdfIn PDF document text
    • http://temolujipu.myartsonline.com/what_does_a_social_science_research_assistant_do.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/gre_1000_words.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 5860 bytes
SHA-256: eefba11c70ab5415983184b49d72f1d0d9fe95a02bd7ca6425fe7f426dc82ffc
font_01_sfnt_off0001147e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147E 12544 bytes
SHA-256: 2df7c699a94fd231a7dd2eff609e9bb6078ee41c2affbb29d14cd609246ad66a

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