Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d871a69862842d…

MALICIOUS

PDF

90.3 KB Created: 2021-04-23 14:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e60dc554d4dafc85d44156ba476f76ca SHA-1: b16beba624347c062cdf65a497eebc173765c0b0 SHA-256: d5d871a69862842dc933af19a5f5da9e5c6bb6ccf44667d4efd0a892cd9f6487
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, suggesting it functions as a link farm. The primary purpose appears to be directing users to a wide array of external websites, potentially for SEO manipulation or to host further malicious content.

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://jacksth.ru/strik?utm_term=manual+de+organizacion+y+funciones+de+una+empresa+de+seguridad+privada PDF link annotation
    • http://cafe-cok.ru/how_much_is_an_old_typewriter_worthqtl0e.pdfIn PDF document text
    • https://zawawileniweja.weebly.com/uploads/1/3/5/3/135317922/3562671.pdfIn PDF document text
    • https://cdn.sqhk.co/juzosugun/gthhXCe/cold_war_beta_pc_release_date_time.pdfIn PDF document text
    • http://vugiris.22web.org/all_the_lovely_bad_ones_download.pdfIn PDF document text
    • http://autoport76.online/brawl_stars_mod_apk_aptoide7v067.pdfIn PDF document text
    • https://tezagezowuvese.weebly.com/uploads/1/3/0/7/130775310/7695229.pdfIn PDF document text
    • http://mkr-olimp.info/85759795434nvd7s.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/shevApz/45715465521.pdfIn PDF document text
    • http://wacc-cat.org/romiwijazivalavanekirukodmij5x.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/94279032424.pdfIn PDF document text
    • https://cdn.sqhk.co/gulidepiz/Ggfgjfp/11145502531.pdfIn PDF document text
    • https://medotufise.weebly.com/uploads/1/3/4/5/134512565/e03e2f683535.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/jbjhje2/king_of_kickboxing_movie.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/582117338489bf92.pdfIn PDF document text
    • https://kupifibadobibe.weebly.com/uploads/1/3/4/5/134512214/72c8d.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/pamalomizidetadameza.pdfIn PDF document text
    • https://cdn.sqhk.co/girolivudafo/j7hlsgi/pawoxigexami.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/igcghjf/backflip_madness_extreme_sports_flip_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tijetefewojo.epizy.com/canasta_familiar_en_bolivia_2020.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_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 5692 bytes
SHA-256: a135a59702da20b6ea5f05ea1478af0b24a694c57f297841c016ed088b0688d1
font_01_sfnt_off00013614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13614 11552 bytes
SHA-256: 875d412a0ec4ffeb2c4149094bac16490c05f085a7b861bc521aceb32b7e453b

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