Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b7ff62e42b98c5…

MALICIOUS

PDF

117.3 KB Created: 2021-03-31 16:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0d68b23a41e5cc2e5245168d347466a9 SHA-1: aa767a36a3c682e1467ec80af69bedf1b6aae06a SHA-256: 57b7ff62e42b98c57de7fe2bfeb037fee086a7412be975c2fee1001501ee65d0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, including 'dugedepap.ru' and 'gagigijaloj.22web.org'. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'oecd guidelines wikipedia', suggesting a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure itself facilitates redirection to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dugedepap.ru/123?utm_term=oecd+guidelines+wikipedia PDF link annotation
    • http://gagigijaloj.22web.org/can_all_lg_tv_connect_to_wifi.pdfIn PDF document text
    • http://mitedujonajezed.scienceontheweb.net/ccdp_arch_300_320.pdfIn PDF document text
    • http://kulanonalum.iblogger.org/fluorescence_spectroscopy_instrumentation.pdfIn PDF document text
    • http://webmastervlad.ru/kewigirutita54gr4.pdfIn PDF document text
    • http://55571.ru/tazatedegulodexy7dcy.pdfIn PDF document text
    • http://weroserigo.22web.org/54634840190.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jekivuzogir.rf.gd/nabokov_signs_and_symbols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f59785-efe1-480d-a80c-a738fcf69aff/60590609689.pdfIn PDF document text
    • http://xukokumo.myartsonline.com/wugikubatep.pdfIn PDF document text
    • http://vaxapikezojupid.rf.gd/gobalelujuzogajafi.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/89524018834.pdfIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/stock_market_hours_friday_july_3_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/marogimuxiwel.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/flight_simulator_2018_mod_apk_android_1.pdfIn PDF document text
    • http://nexebudavosev.epizy.com/23173480260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb4fe1c-75a7-4991-b7de-1115e2970680/sarudev.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/openpyxl_two_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/61722583426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225399bc-8b39-4873-b334-d2d43c825034/65179212869.pdfIn PDF document text
    • http://numarape.rf.gd/esl_teaching_methods_and_approaches.pdfIn PDF document text
    • http://vewitemagim.rf.gd/48347797392.pdfIn PDF document text
    • http://rixuroruwe.myartsonline.com/chair_ergonomics.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D49 5020 bytes
SHA-256: 3ec61ee0438f8359d079b7061df15252ff7e497dcd711c17195f42214b5cac9d
font_01_sfnt_off00018e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E7C 13948 bytes
SHA-256: c7423c766b5975b9c0d10d78da88b1a9608f3079621a9280998fb044e48f2ad4
font_02_sfnt_off0001b9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9AB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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