Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35316edc2f41890…

MALICIOUS

PDF

73.3 KB Created: 2021-02-28 23:22:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b6e1fce67c5e95bd7b38d0d03834c37a SHA-1: 5f1fcd2f1ddc297243318e9e271aa67a4a17798e SHA-256: b35316edc2f418901db56e5da60fb415d4c31dfe5cd807d7789b29cef022d771
126 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous links to external websites, including one that appears to be a search result lure related to vehicle towing capacity. The presence of multiple disposable domains and link farms suggests an attempt to obscure the true malicious destination and evade detection. No scripts were extracted from this sample, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=how+much+can+a+e350+van+tow PDF link annotation
    • http://vanimerukaguto.scienceontheweb.net/31884042876.pdfIn PDF document text
    • http://wemepena.iblogger.org/56739058433.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/66898773915.pdfIn PDF document text
    • http://vegemisabuxum.22web.org/bezubaan_piku_song_pagalworld.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/mubolubulobut.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/what_are_the_lexile_levels_by_grade.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/diablo_2_armor_runewords_by_rank.pdfIn PDF document text
    • http://runavowof.22web.org/sebipexatuwibus.pdfIn PDF document text
    • http://tideparipawovu.mygamesonline.org/diferencia_entre_el_destino_manifiesto_y_la_doctrina_monroe.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/samsung_tv_service_menu_with_smart_remote.pdfIn PDF document text
    • http://pijonon.22web.org/82251230465.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/bejokazemur/business_name_registration_form_jamaica.pdfIn PDF document text
    • http://niwerujegip.epizy.com/rotadux.pdfIn PDF document text
    • http://sabuxixu.epizy.com/lubudesarofozar.pdfIn PDF document text
    • http://suzurexitumafod.epizy.com/save_layout_template_autocad.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/are_ssa_survivor_benefits_taxable.pdfIn PDF document text
    • http://gafodix.myartsonline.com/do_airbags_work_in_rear_end_collision.pdfIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/minolta_mn35z_battery_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/puzzle_piece_template_printable_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/piwupawu.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_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 5276 bytes
SHA-256: 287b222af7cd97d805d43d0f2abed68bc7a8ed956f67f30afb70d78c0617f29d
font_01_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 10488 bytes
SHA-256: 09b5576acd6707a4b77c40683c8d6b0646fc0c0c0d72f7be28ee2983027876e9

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