Malicious PDF — malware analysis report

Static analysis result for SHA-256 1324e551690203de…

MALICIOUS

PDF

67.2 KB Created: 2021-03-11 11:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b170e80fc4c3f137381ce9d1e0478a47 SHA-1: 5cab36a71d7dbc9ea51794b612f2e8ea3ea47400 SHA-256: 1324e551690203de844e66049b729a05ab71b2a902ebe8b1a70808d2c9fa8ef3
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a compromised site for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and embedded URIs are sufficient to infer a malicious redirection attack.

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://pelibifir.ru/wix?keyword=brutal.io+unblocked+at+school PDF link annotation
    • https://zivexuxa.weebly.com/uploads/1/3/1/8/131871677/b5f5d7a691b.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/YjgHXhg/92494180067.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/dinepadubulizomovixox.pdfIn PDF document text
    • http://fagogit.sportsontheweb.net/how_to_connect_jabra_bluetooth_headset_to_computer.pdfIn PDF document text
    • https://wisadokuresagor.weebly.com/uploads/1/3/1/4/131436967/1415532.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/hJYiFLb/draw_in_word_mac.pdfIn PDF document text
    • http://piguzipudoval.iblogger.org/xamedasasumokut.pdfIn PDF document text
    • https://malavaxun.weebly.com/uploads/1/3/4/0/134018228/1e1c6.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/fonazuzixagizir/97925941754.pdfIn PDF document text
    • http://jeburam.epizy.com/joomla_templates_3._8_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/vuroniwutatiwaropalake.pdfIn PDF document text
    • http://fozabenisos.epizy.com/sepefarufelowigo.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/duxunepadupimodix.pdfIn PDF document text
    • http://nadezuj.epizy.com/online_quran_classes_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/vurixobibiludisi.pdfIn PDF document text
    • http://mozolawaguj.epizy.com/migisenebup.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_off0000c9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CC 5312 bytes
SHA-256: 9c2fb32fc66f8ee2659da12d583269ad0821dd7dd18406c9221e4ebc78b35157
font_01_sfnt_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 10700 bytes
SHA-256: 7c549ae162da60c2bb7d81ba51eaa7de18bc98035aba49e18ae3993dfb6881f2

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