Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0aebdac91ecaab…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 11:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d867a15b881c88b56ac43e3cda12ee2a SHA-1: 9acf62b8627c6b317ef517f3a47addd946aef738 SHA-256: 0c0aebdac91ecaab134261a5a138e1f62fae06b1cb02ecc4c8c2531ee1dd1521
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful content. The ClamAV detection further confirms the malicious nature of the file, likely a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=la+biblia+delos+caidos+pdf PDF link annotation
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c3203763---xofopalux.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/97207053108.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/pifofi.pdfIn PDF document text
    • http://veitali.com/upload/files/judalobatiwaru.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/38743156188.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/94205080393.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/4cvrrfj5bchob5tvc4n9f46h73/xagufiwikifupomid.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/74022820836.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/mivexoketum.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/libewutatimuxarisilunenor.pdfIn PDF document text
    • http://fitviewer.de/files/file/94956910057.pdfIn PDF document text
    • http://szhlfz.net/upload/pimojipulabizufokukije.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/bogafelolarilozej.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/23475006742.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/miwoziliwikozulav.pdfIn PDF document text
    • http://thaide.org/userfiles/file/vanadetamigolanisit.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/gezakisaromoxi.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/49155675610.pdfIn PDF document text
    • http://anpo.vn/upload/files/nivubomajelafa.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/40071488576.pdfIn PDF document text
    • http://unsersohn.com/images/file/42830248579.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/5584891559.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/kipojizofugijasowepu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 10408 bytes
SHA-256: 573da7ba1b4c65093fbf23c8316b6d9c48b9295acafe7362a14eddb043c5a143
font_02_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 22052 bytes
SHA-256: fd207de871047b7f1de2ca200c38c69472821ecf63f675123fd591efc537d5fb