Malicious PDF — malware analysis report

Static analysis result for SHA-256 2587d1d4b691e80a…

MALICIOUS

PDF

79.2 KB Created: 2021-03-21 06:00:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a6901993c745360a0c8f8f0ae01e151 SHA-1: 1418172904693477bd8c04e5bafd5ef00da882ae SHA-256: 2587d1d4b691e80a98b6b15a9d3685041d9f80140f4954bfd35263f72f7ef6da
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are generated SEO-style links, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/wix?keyword=tv+pilot+scripts+2019
    • http://nuferakake.iblogger.org/zuwonesifiratonevo.pdf
    • https://moliveje.weebly.com/uploads/1/3/5/3/135323163/vekugoledip.pdf
    • https://zabokibijeg.weebly.com/uploads/1/3/5/3/135350751/4326476.pdf
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/valutibatimevinimaku.pdf
    • https://repugololenip.weebly.com/uploads/1/3/4/8/134880500/cd3f0f51.pdf
    • http://pezidibega.iblogger.org/jevukeradefuletikuge.pdf
    • http://givupuxorow.iblogger.org/98900949522.pdf
    • https://kopusinuzek.weebly.com/uploads/1/3/4/1/134131929/juloletotizol.pdf
    • http://vozuzutiwajuzip.getenjoyment.net/madjax_rear_seat_kit_club_car_precedent.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rodedewezijore.atwebpages.com/how_to_mix_paint_4-1-1.pdf
    • https://s3.amazonaws.com/libosokune/partnership_agreement_format_in_bengali_language.pdf
    • http://zerujafulo.rf.gd/ryobi_ts1346_miter_saw_review.pdf
    • http://galiwasik.rf.gd/mogepuselifejubomume.pdf
    • http://bojuzafi.rf.gd/pink_floyd_comfortably_numb_backing_track.pdf
    • https://s3.amazonaws.com/viboxikuz/navy_recruiting_ribbon_gold_wreaths.pdf
    • https://s3.amazonaws.com/tumasun/22679127751.pdf
    • https://s3.amazonaws.com/xalexojaxipud/current_war_subtitles.pdf
    • https://s3.amazonaws.com/devuxuzejozam/7318627755.pdf
    • http://jabuzom.epizy.com/auto_reply_email_template.pdf
    • https://s3.amazonaws.com/netinuwa/pofijuvigi.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_off0000f72d.bin
93192cff9d832039816c8e51fbd19b2678d44ffcd9977114d452e20b3a30944b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 5208 bytes
font_01_sfnt_off00010906.bin
0f33053c3c057fdc607f5e5510b1ed46129d705a82ece08ec12bc055f21617d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 11296 bytes

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