Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0c4f51a472ed2f…

MALICIOUS

PDF

78.6 KB Created: 2021-02-26 18:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ca8a6fe1fc5131d7f670c416995e2fea SHA-1: 506046571a5f513501393e9e44fb38cb25b65902 SHA-256: 4f0c4f51a472ed2f6225a3118a86adeac49143213f54ca8d7180963df1f0e33b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/123?utm_term=best+classical+guitar+tuner+app PDF link annotation
    • https://cdn.sqhk.co/kitolitik/hftxE5P/22276343661.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/jihjfDH/lawnchair_v2_vs_nova_launcher.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/que_es_ficha_tecnica.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/zorinedumapupatsext.pdfIn PDF document text
    • https://fisoguxosat.weebly.com/uploads/1/3/2/7/132740182/lototenot_putosureduvu_pusefadogitir.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/6294411.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/TPjavwI/turbo_tank_star_wars.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/hjgfUyo/juwimojukofulukakeziva.pdfIn PDF document text
    • https://cdn.sqhk.co/mipekakiri/ighdhci/xikujajibugulipesuxorip.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/e0cd103503.pdfIn PDF document text
    • https://cdn.sqhk.co/dusimefosix/ilhbibX/vanilla_cake_recipe_easy_at_home.pdfIn PDF document text
    • https://jebunofom.weebly.com/uploads/1/3/4/4/134468214/vewudifizijoxude.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/bisute/21775241296.pdfIn PDF document text
    • http://widifusi.myartsonline.com/the_age_of_reason_begins.pdfIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/microelectronic_circuits_7th_edition_solutions.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/catch_me_if_you_can_dual_audio_hd_movie_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/avengers_endgame_trailer_3gp.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_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 5148 bytes
SHA-256: 20cae8fc9623dc013b287a5830ab1547d498b1d089d587ee3af600ad27db1057
font_01_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 11400 bytes
SHA-256: 6ffb94a878f21f9a7f2461939aa4f22920abcd40cb8063424555b6d11c848511

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