Malicious PDF — malware analysis report

Static analysis result for SHA-256 efed6dae6e7fc95d…

MALICIOUS

PDF

76.3 KB Created: 2021-02-15 09:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d9a8f1e2ed37026467e2494f9f824e54 SHA-1: 49925535878570d6291c07bea1def578cb186f51 SHA-256: efed6dae6e7fc95d2bbb9d89fbbe9233116a850a4ad6f2ef7fc5dc604fab5c41
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely spearphishing via attachment.

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://leonvi.ru/strik?utm_term=youtube+subaru+crosstrek+2018 PDF link annotation
    • https://cdn.sqhk.co/savaketiju/Fhi2ibT/tikajow.pdfIn PDF document text
    • http://tgesheff.xyz/arcane_legends_mod_apk_1._8._4u372d.pdfIn PDF document text
    • http://remontnatali.ru/identify_three_examples_of_bismarcks_use_of_realpolitiky1fj3.pdfIn PDF document text
    • https://kuvezuwuziteb.weebly.com/uploads/1/3/4/3/134388010/towadopezanif_petodidexil_vumexatodozinu.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/nemozebixexela.pdfIn PDF document text
    • https://cdn.sqhk.co/dozirolizilu/ezhbifX/chatical_video_call_chat_messenger.pdfIn PDF document text
    • http://probkin34.xyz/naa_autograph_songs_freecbcig.pdfIn PDF document text
    • https://cdn.sqhk.co/manoxixo/f92fdhd/falamupajuvotizuregeguro.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/ihgcTgc/soul_stone_simulator_thanos_egg.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojonujaj/ejagjih/olympics_2016_swimming_dates.pdfIn PDF document text
    • http://daating19.site/horse_and_cart_racing_australia_calendar9xkxq.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/7Tyx65v/north_star_academy_fairmount_campus_newark_nj_07107.pdfIn PDF document text
    • https://cdn.sqhk.co/muvifisi/qLgc5id/calendar_2020_printable_free_july.pdfIn PDF document text
    • http://remontlegko.info/21609676594q0oyd.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/1WYnjeT/nanamon.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/Byoshj3/dingleberry_song_kevin_bloody_wilson.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xevaxujexodo.epizy.com/acing_the_coding_interview.pdfIn PDF document text
    • http://wetedezowob.rf.gd/nugebeju.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_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 5448 bytes
SHA-256: 0b28667b7bef6caf06bedde2b709b2b1eeea258195fca4f4f4ad05968f963a1e
font_01_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 10428 bytes
SHA-256: 4ec0f5091acaace59ccf0938c485e773b430c74d951ef917bc31c95327432225

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