Malicious PDF — malware analysis report

Static analysis result for SHA-256 233976510b1d14fd…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 03:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a27438add11cf0e7596037156175e895 SHA-1: 6772fb4af453ca36a0bc1230eb078d031d8aac04 SHA-256: 233976510b1d14fdb217c64b46cee61493c18539761f2538e1440d3dede4f5f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common technique for distributing malicious content or conducting phishing attacks. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect the user to a malicious site, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://acecaalcoy.com/userfiles/file/28801354708.pdf In PDF document text
    • https://vasantviharproperties.com/userfiles/file/4820659845.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/tipamut.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/55906681473.pdfIn PDF document text
    • https://norservis.info/files/files/52456991542.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/27588597951.pdfIn PDF document text
    • http://mq-water.net/upload/vusavevofakubipe.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/6519309863.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/tajedasewofopemutojaju.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d2ba1c7a2bb62cf8753ed6c4ee899f96/99203102072.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/2499785669.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/40360384616.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/jaligisa.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/54027796447.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/fibusawababiwenolos.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/49223049299.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/madujegududitusonamiboli.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/29428536050.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/38384413262.pdfIn PDF document text
    • http://rayanchem.com/d/files/xirulewajedatot.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/kafuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=questions+on+environment+with+answersPDF 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_off0000b0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DE 17240 bytes
SHA-256: ff550c780d085c505198089c692ecf99cf27f9775bdd9f788e20b9c6ab8f2c4a
font_01_sfnt_off0000dd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 10640 bytes
SHA-256: 49067145100a468a2357b4a5681a5954bb7f5c88e9c31063f9fdc456e4b53702
font_02_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1