Malicious PDF — malware analysis report

Static analysis result for SHA-256 54bb2685c3204a4a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 14:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 248ff750df6269d040ca1e3f3eff3c78 SHA-1: efb65a67fc3ab17b67d520f28bd0040b2c6e5952 SHA-256: 54bb2685c3204a4a56a4828f9e33aa5216402b02b297128b7babfc73bb3642c0
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. It contains a large number of embedded URLs, many of which are on disposable hosting and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or phish credentials through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://synerhu.ru/uplcv?utm_term=comic+book+maker+free PDF link annotation
    • https://nstoplana.rs/ckfinder/userfiles/files/60841998017.pdfIn PDF document text
    • http://4bx.pl/public/file/76606356423.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/pokukiludopemasapixapavav.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/39102205150.pdfIn PDF document text
    • http://52963566.com/upload/file/202109071645401617.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/48921376946.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/70615764991.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/33596769552.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/pavefapikorobudi.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/28222294219.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161409fcf87130---bimijosaxoporo.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210913_F5F3E26D0B457F79.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/53316450519.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/xexanupugadekuxed.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/ramuwekivuluvotakup.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/44967892991.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/rulunuxa.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6d2ead1c7da43efc8df95a767b2dd5e/ginenadifajobibaw.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/vilimiropukideraduninon.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/49227688100.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/79485789427.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/bapamenuvokigew.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109080619325931.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_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 18036 bytes
SHA-256: aaf216980d2269023e1c4b9090ae0b429ab36cc3d83000461043403262277023
font_01_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 10344 bytes
SHA-256: b822f0052c31d34850987b40f40f997d29b2f79ddc885176eb99825976263efa
font_02_sfnt_off00012c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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