Malicious PDF — malware analysis report

Static analysis result for SHA-256 73926faa8e36b852…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 00:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a19f47981b6847dad7c8748b1caf3db8 SHA-1: bdf2fce775e36ea50a5cc81f3ab2e82e518a0810 SHA-256: 73926faa8e36b85240a1b446957c8bc858a74b49f438a5d1dc374160a7b3d058
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, and exhibits characteristics of a link farm. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://garglob.ru/uplcv?utm_term=find+my+my+android PDF link annotation
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/513b3a3d4e49dfe448914e47bd6f1e09/7816257911.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/semukezikusanosug.pdfIn PDF document text
    • http://dakov.hu/_user/file/24503705205.pdfIn PDF document text
    • http://freewest.at/45240543385.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/33336258697.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/zovawaxavuseroma.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/fewigisu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613018a827eb6---bemovepexeb.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/mesivototugubopupirorol.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/62240764921.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/diladobomoletizozofobix.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/21756316041.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/18994508127.pdfIn PDF document text
    • https://cargobull.cz/res/file/vajokobigegenuvogo.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/samosir.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/buvexijelabedun.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/xenodif.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/82109100201.pdfIn PDF document text
    • http://ustunongel.com/image/files/nababos.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/68278760092.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/47211307590.pdfIn PDF document text
    • https://vleek.com/uploads/files/88706955300.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/4900133617.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_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 10056 bytes
SHA-256: b635f5a8b11173a1c25222d0d942a4ae0517c882a3e533050174bf92e82fa431
font_01_sfnt_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11892 17296 bytes
SHA-256: e01a2d5b5ed221e498ebc8717de90396d4ae6fe2293c49df29e9d13abdd2bb98

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