Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7058b2ccb72aeb1…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 12:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 30ed451bc6f501bbb9d906bc9df8de42 SHA-1: cc8bc6a853911961b1b908b1d7c1d17fe042f3b2 SHA-256: f7058b2ccb72aeb17346646e538b9aae3b36d0664ced4db5213a422d9eb1d2b6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt users to call a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the overall structure point towards a malicious document designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://hvezda-pardubice.cz/files/file/22457753555.pdf In PDF document text
    • http://abc-tel.ru/data/File/vesopefopitoxese.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/87428415608.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/bololutozus.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/jepowenaveverelixaruve.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/23661820343.pdfIn PDF document text
    • http://sun-tes.ru/files/file/jetamuxigino.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/42773596025.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613562e39a97e---37998749355.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/vijomadonavalopo.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/zojiselekolegawawe.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/5192013476.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/levegige.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/lutebufejizukimofitudune.pdfIn PDF document text
    • http://glassick.com/userfiles/file/5318935174.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/nadizusimekibufen.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/wilewolulij.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/68646095325.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d67c0e392---36554451996.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/zotamapedetepegoxa.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/72502399041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=c%23+in+nutshell+8.0+pdfPDF link annotation
    • 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_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_01_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 18592 bytes
SHA-256: e36ba595e2e73d08a1b1691928e99392da881ea1733579587bd88d99b76549ef