Malicious PDF — malware analysis report

Static analysis result for SHA-256 664cd125692ffa5d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 08:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 598655dbd3594e0b1a4ceb20485cee26 SHA-1: 05acb3a3a4923f6e1d7a58092e6538ea089ce495 SHA-256: 664cd125692ffa5d8d2eee18040eb1ab7c26798a76464a7f3b514b1c18032e72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://czernavendeghaz.hu/admin1/file/45573421011.pdf In PDF document text
    • https://majubesar.org/contents/files/29632049344.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/69384565279.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/33374443824.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/29960674536.pdfIn PDF document text
    • https://glozor.com/userfiles/file/fojewavejo.pdfIn PDF document text
    • http://ymmicro.com/files/files/bopiwobilozuli.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/28824949043.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210921_191118.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/14792810924.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/rejaxukegawigefiba.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210911062904.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/2774988643.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/33015016245.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/91902955583.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/67282105706.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/31664975537.pdfIn PDF document text
    • https://purefeeling8.com/data/file/berojebodagosivufo.pdfIn PDF document text
    • http://cmtsport.com/pliki/najizegoman.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/49469607103.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/54585947805.pdfIn PDF document text
    • http://apsons.eu/files/file/83908814928.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/vixamuko.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/gufuvexisegerodonukob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sat+practice+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_off0000b186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB186 17784 bytes
SHA-256: 6d78ffb21f32cbc4c5661139fc3b05515b1d60f893f1b20cf98ad9fbc5cec0d5
font_01_sfnt_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 10252 bytes
SHA-256: 560fcfc09626f583f235465b4c7a14f1391052c4cec99914afafefae08efe20f
font_02_sfnt_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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