Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea2612dd483c4b1…

MALICIOUS

PDF

97.8 KB Created: 2021-09-21 10:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 936b56253991c5723e1cfb99f68bdb40 SHA-1: 6f13b7258bdba1325d1c6e6a4bf7a9c159748f8b SHA-256: 0ea2612dd483c4b1303cd7d9daa4a9a5a08ef1b6c73bfb9ba3e5a57783e300df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious domains. The presence of external URIs and the 'disposable link farm' heuristic strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://metaglas.kr/userData/board/file/86183589429.pdf In PDF document text
    • https://onutglen.com/caningest/images/file/25242778600.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/69487147648.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/jikolavuna.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/ganow.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/ramowazizowujogil.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/baxat.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/rolokunurakefuvaditezo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bb0944f0f---85206520880.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/93573053311.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/wodipunadesig.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/39799488471.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109041603225342.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132402772a2d---sediposu.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090810515580554.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/17370944924.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/17047092637.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/nugopafogokujadifeporekiv.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/nosuxagebixupa.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/buxeso.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/zizusilesawikavivapuneser.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/sezudiwurodonivabixiloduk.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/danalibixijiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ubuntu+chroot+androidPDF 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_off00011677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 10368 bytes
SHA-256: e5fb8ecf77d620f46573d7114fe66b26b2a59d0f19393756588a7a3a0bcf9c30
font_01_sfnt_off00012dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 19588 bytes
SHA-256: fe939415c4461b5c3c6b69391febb64693e379f2e21bc764b4e216eae48ac4f6
font_02_sfnt_off00016178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1