Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59426a2f3e19014…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 19:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85ba0516d0f266dd51684d50606213b0 SHA-1: df80bc9ffd0ea04add85c38afa733b3a9ed6d3e8 SHA-256: c59426a2f3e19014ade5443a482b54c41e8bbb9d88f95a60bfbc631395aac8cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains, many of which are unknown or suspicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://ap-qatar.com/userfiles/files/30456403050.pdf In PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/67789186648.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/77116714531.pdfIn PDF document text
    • http://unibox.lv/files/text/dujirogezamek.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/66320484711.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/53198795412.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/rabotemibip.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210911020328.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/nafenezopo.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/bebulusadelu.pdfIn PDF document text
    • http://wdnederland.nl/file/53640169030.pdfIn PDF document text
    • http://receptlap.hu/files/suvuvuzatogogarukulimuz.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/77441124363.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/pusowufewetofog.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/sobav.pdfIn PDF document text
    • https://mackbeks.com/files/file/buvekonuwufukena.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613db90a6e0ec---pesoxunibusurikixemusogu.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163133092799774002616.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/bidilefoxox.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/39219137005.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/9608871505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=adelaide+synoptic+chartPDF 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_off0000d1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B2 17436 bytes
SHA-256: 308fd83815b40b1c7df07b0bf50b8a139c3d7ca3dde1ebd7b5e55bd94f17ec0a
font_01_sfnt_off0000fe83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001169a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169A 10704 bytes
SHA-256: a623cf1bee1d42c63ee921b2b6284be063b908d44aae0206e15accd90874a171

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