Malicious PDF — malware analysis report

Static analysis result for SHA-256 47139018359467f7…

MALICIOUS

PDF

87.4 KB Created: 2021-09-12 18:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de032bb9a4cd9a887fe6694ba1ade8cb SHA-1: 660a2fc6026ed9ed9a094b52e4539514ded9a90a SHA-256: 47139018359467f7fe4bd44249c36a8eef3ce6c0163e0a43fba29dc3915866c3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. The 'SE_CALLBACK_LURE' heuristic specifically indicates the document prompts the user to call a phone number, a common tactic in tech support scams or refund fraud lures. While no scripts were extracted, the PDF structure and embedded URLs suggest it's designed to direct users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=my+phone+bluetooth+is+not+working PDF link annotation
    • http://daearesort.com/FileData/ckfinder/files/20210902_7135A95DD2ADB9F4.pdfIn PDF document text
    • http://nessium.net/userfiles/file/73546894558.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/96347573637.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613deca7f2219---xiwiveze.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/lefikuful.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/wufatutobanewoboso.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/dotekuvosekojajenosu.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/gitida.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/57622640403.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/salipamirezixagoputipome.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/vexafuxuzen.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/5128035341.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/91125943607.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9c1ddfaae---16367811534.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/62502607994.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/97506557880.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/jisofepimopozixaxira.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/14960570823.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/paxofojadobatorel.pdfIn PDF document text
    • http://intertravel.hu/_user/file/tagirifogepamavumoje.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/11672428878.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/supelulat.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/gemimalorugapotegizut.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_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 18328 bytes
SHA-256: abb789e5e8148415bc263923b5bb5b6973ad80ebcac8ad016be1e300b8cfa5f8
font_01_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13751 10892 bytes
SHA-256: 2d4a94f051b8a96540fb0d9de32122945bfce6999e7e7f5852a092418badc5c6