Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada4255b46b2ee2b…

MALICIOUS

PDF

73.1 KB Created: 2021-03-02 07:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 077be218ada3f0037c8e48bc20d8a35d SHA-1: 69875002c4d6d30dd24dc1130af311c726c128b0 SHA-256: ada4255b46b2ee2bf82c61aa7cb06edf73e86e467659d64eb208092d2d933b64
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs point to various PDF files, suggesting a phishing or SEO poisoning campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=the+algorithm+design+manual+pdf PDF link annotation
    • http://nemosixumeki.mypressonline.com/nezixudidixuxutipi.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/68121405999.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/6901129624.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486035/normal_5fee48ded1502.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muropep.epizy.com/tujuzafosexup.pdfIn PDF document text
    • http://xekazaz.myartsonline.com/grigori_grabovoi_knjige.pdfIn PDF document text
    • http://duxuvogavibu.epizy.com/which_epson_printer_is_best_for_sublimation.pdfIn PDF document text
    • http://jokosen.atwebpages.com/11560769858.pdfIn PDF document text
    • http://vopobojadufej.rf.gd/java_64_bit_full.pdfIn PDF document text
    • http://fulawumobolofog.epizy.com/76756172024.pdfIn PDF document text
    • http://nuforikoxiv.epizy.com/xesip.pdfIn PDF document text
    • http://fisuzes.epizy.com/loctite_242_threadlocker_safety_data_sheet.pdfIn PDF document text
    • http://fobegakolu.epizy.com/koradasosenexujotituwid.pdfIn PDF document text
    • http://makuwuwamev.rf.gd/38643658746.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/roduxovalezek.pdfIn PDF document text
    • http://fufezexu.epizy.com/chiavenato_gesto_de_pessoas.pdfIn PDF document text
    • http://gafodix.myartsonline.com/49031582102.pdfIn PDF document text
    • http://bipedok.epizy.com/letasoft_sound_booster_para_android.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_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 5404 bytes
SHA-256: b3df992c44f9172b90ece57af738cd681e176fbe69a5815ca96de2fedb5fb7c9
font_01_sfnt_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 11448 bytes
SHA-256: f2afc130c0086ce2e5fba71ef9a61fe29df4c04da81cb96e92f7ffa0ca306993

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