Malicious PDF — malware analysis report

Static analysis result for SHA-256 a428c0750cf46e7e…

MALICIOUS

PDF

76.4 KB Created: 2021-03-18 12:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1ff13a767b7794f08b1ac26e6f54c7a0 SHA-1: 53d73c2f8d2709725eb32e3b3351d1095df3edac SHA-256: a428c0750cf46e7e3074cbcff31b13924f681410c2b0669aff58a4536c338c8c
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. The document body, though heavily obfuscated, contains text related to a 'login' lure. The presence of numerous external URIs, including a link farm on disposable hosting, strongly suggests a phishing or redirection campaign. No scripts were extracted, but the overall structure and heuristic firings indicate a malicious PDF designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://resalured.ru/wix?keyword=quaver%2527s+marvelous+world+of+music+login PDF link annotation
    • http://sreda.city/45160828664zq6b6.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/ujft1S6/74793929525.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/MHRjdhd/68488412520.pdfIn PDF document text
    • http://gibelineg.sportsontheweb.net/66620669116.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/ji6JgiF/legendary_muscle_car_races_videos.pdfIn PDF document text
    • http://dirozigumifew.scienceontheweb.net/85931948483.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/jjifggz/luteburik.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/RMOhjhg/61151801973.pdfIn PDF document text
    • http://ampinternational.org/xezuxufovapufoxaxomatajubptxpn.pdfIn PDF document text
    • http://bluebadgeapproval.com/matomurararofitokoropekaoz12g.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/93940899128.pdfIn PDF document text
    • http://hookup750.website/reading_comprehension_book_grade_2fzuc5.pdfIn PDF document text
    • http://tryse.xyz/how_to_remove_light_cover_from_hampton_bay_ceiling_fan3q4xs.pdfIn PDF document text
    • http://comforfemj.fun/pijetuvokuvokasatoragdovi.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/zulezov/bejujujanosamaxoz.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/rainbow_study_bible_reviews.pdfIn PDF document text
    • http://wufuxabarerinuw.epizy.com/les_mis_cardiff_2019_review.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/16950657394.pdfIn PDF document text
    • http://saboveliga.myartsonline.com/arcadismo_portugues.pdfIn PDF document text
    • http://lejarojat.rf.gd/suwazinedakeregomak.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/65601147643.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/56566425828.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_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 5588 bytes
SHA-256: 4dc15ac371b3d9b50e56431340ef083df8904e8db3a3fbe8ef23ae91601c8503
font_01_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 11704 bytes
SHA-256: f4551d035619100e27c691e4493cdd00e8b832bd3a4e04168845750af74eaf6f

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