Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f5456ecabbd19d…

MALICIOUS

PDF

71.7 KB Created: 2021-10-02 20:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 85a907f6b75ec6ca7a0486b8eb4dad95 SHA-1: 6c40c3d0d73c0eccd1fa9315612bf3d007191608 SHA-256: 66f5456ecabbd19dafd199a9fe0d5fd28f52da79e0ce76c6b89ee68b9a57f58c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable domains, suggesting a tactic to obscure malicious destinations. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

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 http://gangwonbnb.com/FileData/ckfinder/files/20210923_DF7A9A44158A5145.pdf In PDF document text
    • http://ibconsulting.it/userfiles/files/8120171397.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219301734339855.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/23610159396.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/rojomodusufigafozejijepuj.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/20681757165.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/68323694542.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210925164652843.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/14493343705.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/32039580102.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/gigudupiwenaresolalagipum.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/zasosuvapewosegiwe.pdfIn PDF document text
    • http://www.bash.cl/media/file/paderiretokofalixape.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/89047340825.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/65206352217.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/bemedokifajowi.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/36175259067.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210912204437_svrpiw.pdfIn PDF document text
    • http://goldmustang.com/files/files/77212334338.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/31253034581.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/42497785476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=associates+and+joint+venturesPDF 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_off0000b449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB449 17572 bytes
SHA-256: ea9e5a9faa40a6d550d1ca02abbc8a004835a97eb254da05b9f602cafe6e72f3
font_01_sfnt_off0000e133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 10596 bytes
SHA-256: e74374246ad693bde47ba5abf5f5fda59b945dd0d67af52c6e3383a2e7e3982b

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