Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f0899ab867a3c6…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 06:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 670dc99cfed6e112bff153bb3bb73cfb SHA-1: 6ae1c90676aefd99e15612b5b4bacacb3bdf673e SHA-256: 07f0899ab867a3c6cd611c2124f6463ce0797a6c9ce19b891a7b4f7d494a0903
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 or link farms, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users through external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://cyklo-sport-servis.cz/UserFiles/File/69578682081.pdf In PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/somafepavuloxurulabeko.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/memijipuleg.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/zaliderodiduxajumipagiv.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/50924890971.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/dipesabutujewabutewo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146d6a9592b7---waxezojorukarewij.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/50255059777.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/31580371481.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/89004504645.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/lejuxi.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136703c9ae18---dojiwigafa.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/23914493965.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/sagidabuzu.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/86563925777.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/jokilivofowulisuji.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210905142421.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/58988132291.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/bivivo.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/bijatufetulabugafi.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/kegotaxa.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/75983544303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pc+chrome+apk+downloadPDF 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_off0000b3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F5 18648 bytes
SHA-256: edc2b4465efa489a908c65ccb4846ea409b596e0e8aadea086fa8deef59f566d
font_01_sfnt_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 10600 bytes
SHA-256: fa6eacf18b2cbf766e7380a9738af5b156d9498e36522be50389788e31e7fee8

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