Malicious PDF — malware analysis report

Static analysis result for SHA-256 94cf631d1eec81fc…

MALICIOUS

PDF

74.7 KB Created: 2021-11-13 00:33:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4801f557f3cf08adf8ab0ccb5c782606 SHA-1: 719e79adcc2b90a2c4729457f2a46e0b11177879 SHA-256: 94cf631d1eec81fc2d5640f196116402dfbf571d83f5c8636c00f4f179815e76
126 Risk Score

Malware Insights

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

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 are part of a link farm designed to obscure the final destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting and redirectors, common in phishing campaigns. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/lazudurimamolo.pdf In PDF document text
    • http://dragonspond.com/uploads/files/gukijogene.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/35132065000.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1a30d5dae3080a3e2b5fefba3dfc0536/77444202037.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/goxanobi.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/penamipopatagevokulosute.pdfIn PDF document text
    • https://fond.ru/userfiles/file/31090610599.pdfIn PDF document text
    • http://pinxedien.net/upload/files/libuwujanezikowinudagom.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/jimagagutunevivolir.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/fawokekosudotegis.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/notedogexolezib.pdfIn PDF document text
    • http://nakajima-ya.com/user_data/image/file/tapawijogelagimu.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/pimuzi.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/39911410501.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/guxofevazop.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/90278540981.pdfIn PDF document text
    • https://euromariage.ro/upload/file/wasagif.pdfIn PDF document text
    • https://felixtrail.com/imagini_ws/figixokusexaju.pdfIn PDF document text
    • http://slotkuda.com/contents/files/7770841996.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/tanowoveneso.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/wujuwuva.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/gilevofifoduruxuraref.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/lupitokavajemogina.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/5620711358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BcFPVxLj4jw/uplcv?utm_term=maize+cattle+feedPDF 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_off0000bee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE7 10032 bytes
SHA-256: 010129a6146160772bc4664b25cd3c4087a5211c312ca4739db0578c1e150110
font_01_sfnt_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 18704 bytes
SHA-256: ef802b43c341ba7f13f6f60c14e4769bf0bb5464556df564065e73d277fd138b
font_02_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef