Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74463c38c5b84a3…

MALICIOUS

PDF

78.6 KB Created: 2021-03-22 15:12:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 25ddc8512a099a26c6dc68ed9098f13c SHA-1: bc1eb0920b57a70f74376a329b3906573e9f9e6c SHA-256: c74463c38c5b84a3155afeaab4753ef87c88414d955d9c7f69f3f0bcb62a6a94
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, appears to contain metadata related to search terms and PDF generation, suggesting a lure to external malicious sites. The presence of many distinct and disposable domains further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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 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://botokaw.ru/wix?keyword=scott+foresman+social+studies+5th+grade PDF link annotation
    • http://tegor.xyz/15516148341v2ag2.pdfIn PDF document text
    • http://mon-fortuneo.best/sexaninirexik7l6ct.pdfIn PDF document text
    • http://interior.estate/figure_drawing_book_downloadvlts7.pdfIn PDF document text
    • http://josamaduxano.22web.org/sipexokejezelusa.pdfIn PDF document text
    • http://demejizato.22web.org/jifogufiwaximugujelikolag.pdfIn PDF document text
    • http://gavikaluruvakuz.iblogger.org/causas_de_acidosis_metabolica_hipercloremica.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/challenging_cognitive_distortions_worksheetsypv41.pdfIn PDF document text
    • http://santand-es.com/traductor_de_ingles_espaol_gratis_sin_internetj8ma7.pdfIn PDF document text
    • http://zesamoa.online/walter_chilambo_songs6s35v.pdfIn PDF document text
    • http://ulekschool.online/riximibubxntlt.pdfIn PDF document text
    • http://wexypay.icu/482933622797v03x.pdfIn PDF document text
    • http://reawolt.online/72236406463mqxg7.pdfIn PDF document text
    • http://academic-club.ru/63769598119uvmc3.pdfIn PDF document text
    • http://letnesil.xyz/fanezumakevugomikmjob0.pdfIn PDF document text
    • http://tomogorman.com/xeziragkc1y0.pdfIn PDF document text
    • http://copyrighthelpcentral.com/25183486085i07aj.pdfIn PDF document text
    • http://yandex-delivery.cc/mifimomurefevujogukanowak63i7.pdfIn PDF document text
    • http://tramlaweq.online/104988852860cgjt.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/sugosubexez/nugomibenafumofej.pdfIn PDF document text
    • http://jukikusikodopom.epizy.com/savazuzatamabub.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/5758300101.pdfIn PDF document text
    • http://nasotigide.rf.gd/23816340100.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/how_to_make_hair_grow_faster_african_american_male.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/54752394257.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/how_to_use_rice_cooker_panasonic.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/90989368778.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_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 5660 bytes
SHA-256: 98c598fe316e386a1af633bcc9a6032385f79e536bcebadbb41c595ba050e101
font_01_sfnt_off0001079e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 10912 bytes
SHA-256: 301df36846d14df9e89002ff2d82697138943ebe90ed7afb82fc0c005b5a8ea1

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