Malicious PDF — malware analysis report

Static analysis result for SHA-256 b144c70c4788b4f6…

MALICIOUS

PDF

75.7 KB Created: 2021-03-02 03:08:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cdee4cc02778b13bb1d2cf94fc7eb392 SHA-1: 5cc0ee73e47184f4604b65ac048d9cf77f4d3514 SHA-256: b144c70c4788b4f6d3468e014820290a043ab23081cb1081de79f0e8956569aa
134 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and a link farm on disposable hosting suggests a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/wix?keyword=rwby+torchwick+semblance PDF link annotation
    • https://cdn.sqhk.co/sitosuduf/eXwobLz/dolewulogilizare.pdfIn PDF document text
    • http://nigasheff.xyz/how_to_write_a_letter_of_recommendation_for_a_physicianfq7zd.pdfIn PDF document text
    • https://cdn.sqhk.co/dujovibipu/c8hhrji/qr_code_scanner_railways.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/6ihliiO/86012547368.pdfIn PDF document text
    • http://cesaregaspari.com/maus_espaol_onlinedi8b7.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/jchgehd/mhw_sword_and_shield_guide_pc.pdfIn PDF document text
    • http://kigowamukidiba.iblogger.org/how_much_does_rent_increase_per_year_in_nyc.pdfIn PDF document text
    • http://legugoboxebepe.22web.org/bully_game_free_for_android_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/midijanere/icieid6/wexiwamilogizuwerok.pdfIn PDF document text
    • http://vexawenebo.22web.org/is_usps_international_reliable.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/77024999245.pdfIn PDF document text
    • http://vizojuzoninunoz.scienceontheweb.net/xitisujoruxanadatijasi.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/75263383563.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/fhh4qjc/movie_making_programs_free_download.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/savukojubusum/abu_garcia_silver_max_low-profile_baitcast_reel_right-handed.pdfIn PDF document text
    • http://wixesikive.epizy.com/68074135612.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/47881906192.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 5444 bytes
SHA-256: 128e21a65a23a9fa2d3130c9a0e614e93fc3934fecccf2b085204da4a01a02fa
font_01_sfnt_off0000feb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB6 10360 bytes
SHA-256: ca1d229ef88d01a2c6dcb6d4bd9325917092b1f8fb6659a0f5a6f270b8cb7354

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