Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79395c4bfae23ca…

MALICIOUS

PDF

73.1 KB Created: 2021-05-08 22:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fd3475fc77c467c07a122f5e8dc93ce8 SHA-1: 549b38162caa21e5d724b2dd4cda6f7ed3b1e64e SHA-256: a79395c4bfae23cae50160f03eb2058a8de005877b4a417f8f542131583b1e65
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://xezojetit.ru/strik?utm_term=fairy+tales+hair+care+fairfield+nj PDF link annotation
    • http://fakts.design/dhoom_machale_bike_race_song_downloadbihtf.pdfIn PDF document text
    • https://cdn.sqhk.co/xerejijasoma/8jfiezf/bapafebofolaw.pdfIn PDF document text
    • http://xibevajisigidig.22web.org/81887370247.pdfIn PDF document text
    • http://luranowebereni.22web.org/us_navy_diversity_months_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/jalsZji/55255907184.pdfIn PDF document text
    • http://firstreadersclub.com/nokotoregafoz7n2el.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/dgi4hcd/kakumofor.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/i3Lji5t/23707710421.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/Y2a6Oig/tower_defense_simulator_roblox_discord.pdfIn PDF document text
    • http://winemewimivo.22web.org/88248780213.pdfIn PDF document text
    • http://pinerapidsrr.com/xirowomqdqg.pdfIn PDF document text
    • https://bumilumijoxaxuv.weebly.com/uploads/1/3/4/4/134497753/ce479833f2.pdfIn PDF document text
    • http://evgeniy-semenenko.ru/the_oxygen_thief_summaryrllmh.pdfIn PDF document text
    • https://jinugavov.weebly.com/uploads/1/3/4/4/134438703/fewukatosolo.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/sIPAiel/playpark_top_up_using_globe_load.pdfIn PDF document text
    • http://wacc-cat.org/rosugifefulutajazedinv3n1c.pdfIn PDF document text
    • https://cdn.sqhk.co/xinosemu/hhiSgjL/54254208820.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mokimonanogi.rf.gd/math_practice_worksheets_8th_grade.pdfIn PDF document text
    • http://vidabovon.epizy.com/how_to_program_a_intermatic_light_timer.pdfIn PDF document text
    • http://zujolexefaran.epizy.com/gozevefi.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_off0000de78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 5244 bytes
SHA-256: b0ce7b02de7480011293a66b065e1c63d395643771703d10237939f51d431815
font_01_sfnt_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 10936 bytes
SHA-256: 21e1ac8187aceea6698a3c20ec6140e4ef070ac43569a53e3797ca237d0865e7

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