Malicious PDF — malware analysis report

Static analysis result for SHA-256 2959961e2aa9879a…

MALICIOUS

PDF

70.7 KB Created: 2021-02-18 06:09:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ecb090f505f87e7c69cb8baf55309e7f SHA-1: 763054f5c5ede3fd38bac9a66f65d6c8ab64055f SHA-256: 2959961e2aa9879afcf9836ff7f4d170da9444f3628f9f7090494ca94ec5131a
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, and is flagged by ClamAV as Pdf.Phishing.Trojan. The embedded URLs suggest a link farm or phishing attempt, disguised as a soundtrack download. The ML classifier also strongly indicated maliciousness.

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=in+the+heights+soundtrack+download PDF link annotation
    • https://bodijoso.weebly.com/uploads/1/3/1/3/131380183/99658f3d.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/widie8w/up_first_podcast.pdfIn PDF document text
    • https://mabosuvix.weebly.com/uploads/1/3/4/8/134851695/sufiwuraxi-lutuwewidisis.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/fzgiHhh/36421460532.pdfIn PDF document text
    • https://cdn.sqhk.co/fumazuri/aQigyLi/larry_miller_theatres_st_george.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/bbieERt/lalazorekowuk.pdfIn PDF document text
    • http://manybigs.space/68937871613vlrn7.pdfIn PDF document text
    • http://honey-love.ru/grade_12_economics_textbook_ethiopiahzx5r.pdfIn PDF document text
    • https://cdn.sqhk.co/lerepetoni/KmjihiI/alan_walker_greatest_hits_download.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/jgujd4C/100_days_wild_cast_oliver.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/jc1Iig7/v_moda_boom_pro_best_buy.pdfIn PDF document text
    • http://dompodklyuch.com/designing_data-intensive_applicationjk64p.pdfIn PDF document text
    • http://mazanatur.space/tilotekakarc5a44.pdfIn PDF document text
    • http://zarabotok.space/23982645281im7ao.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_60178249e81c7.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/muwomapotumugi/64220735370.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/wd_my_passport_ultra_not_backing_up.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/innovative_marketing_plan_template.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_off0000d606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 5296 bytes
SHA-256: cdabef47c67acab574e358368db4dcdb8828ec894575efe5305f95a5713bc291
font_01_sfnt_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 11216 bytes
SHA-256: cd899a924347d3b1b8e12b31c2c176c4f650f692cc9a1dcf1cf858e8b2f1d35c

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