Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42da5171d88ff1f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 21:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a71767e1881a87f6c15a9cd9a8e17e8c SHA-1: f58bfffca1f15a4faf23e601981db14dd27deff3 SHA-256: e42da5171d88ff1f5c4bd30b4179ba0b080e75c11172b6b5d88a35ce7d836311
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed for obfuscation. While no scripts were explicitly extracted, the nature of PDF malware often involves JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=behavioural+finance+pdf+free+download PDF link annotation
    • http://deltools.com/userfiles/file/jebarufo.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/tikigokasadidexi.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/wubebexisaxujebelogomawe.pdfIn PDF document text
    • http://medrea.ru/upload/files/24763479425.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dobujumobig.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109041245409151.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/lufojunumugajakovu.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210901205342.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///wujiviriwagefo.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/bigukojibekegivuberuw.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/lexof.pdfIn PDF document text
    • http://goref.ru/files/file/jabakizidabosusi.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/63474968271.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/37714162029.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16131854d7bd1e---64372317487.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/laradegamu.pdfIn PDF document text
    • http://fluorescent-training.com/file/meropupaxekim.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/37821935389.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/roxefikawejiroruvez.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/tajabuto.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/solipevejanuwotosar.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dulasaloronusetujetem.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/41217871255.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/79619854156.pdfIn PDF document text
    • 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_off0000c244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC244 16352 bytes
SHA-256: e960714680e1b5655553d2d979f15e6412c8fcbe25c7dc859387baee9576911c
font_01_sfnt_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 10756 bytes
SHA-256: 2866c03c407c86780b69af2c736f2c8d22f99b7a2b319adcc7ad40da5e35d3ae

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