Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9caf9f3fa3a9a0…

MALICIOUS

PDF

75.1 KB Created: 2021-05-09 00:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 87d34bc646a24d75057a0af207c85a32 SHA-1: 252e105e2922ca9dac62d657b6173dc68c848f7f SHA-256: 9c9caf9f3fa3a9a0da7c33856184cd05d8a83cbdcc33215bef78b79cca8c88e7
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though partially garbled, contains text related to fixing a 'schlage keypad lock', which serves as a lure. Embedded URLs point to domains associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics further supports this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=how+to+fix+schlage+keypad+lock PDF link annotation
    • http://cactusvpn.live/redbubble_coupon_free_shipping9b05f.pdfIn PDF document text
    • http://noxavikadovul.mypressonline.com/apple_airport_time_capsule_manual.pdfIn PDF document text
    • http://sakivometo.medianewsonline.com/bixupino.pdfIn PDF document text
    • http://thedefenseforge.com/kya_love_story_hai_movie_song_download_pagalworldym1bw.pdfIn PDF document text
    • http://zifeladawu.scienceontheweb.net/wilufigem.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/96319549033.pdfIn PDF document text
    • http://erogan-columbia.site/will_liftmaster_remote_work_with_chamberlain_openeraho40.pdfIn PDF document text
    • http://tekupugu.sportsontheweb.net/is_there_going_to_be_a_sequel_to_the_darkest_minds.pdfIn PDF document text
    • http://fizarumokugafu.mywebcommunity.org/xamabifopezemixerem.pdfIn PDF document text
    • http://xofajenakimexo.iblogger.org/68679040655.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://famuvaku.epizy.com/67732388822.pdfIn PDF document text
    • http://duzudolaboxu.rf.gd/7404177205.pdfIn PDF document text
    • http://jekopavopi.rf.gd/sarotufugex.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/lalazekogiba.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/wisconsin_dnr_hunter_safety_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/girevigeko.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_off0000d8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 5292 bytes
SHA-256: bdd4a8b0546167bf62f412524f9fdfcd89439330820aa84589c8f031ec556565
font_01_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 11216 bytes
SHA-256: 002c30afcf95a5370315983ea80884449cebde50958720ea2d79eff61f7d61f5
font_02_sfnt_off00011176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11176 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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