Malicious PDF — malware analysis report

Static analysis result for SHA-256 caff95a394683e51…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 11:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97778d5eba089f58b25d2cfe62c301c9 SHA-1: 5a0931524dc1f6ef437905e606965452872c21ea SHA-256: caff95a394683e5171085c378df6f8e8f2e715de4d60c41d06d7d034ad89fc75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134ecb612654---82391181343.pdf In PDF document text
    • https://milorem-service.ru/userfiles/file/34014934611.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/38378333388.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/26709959569.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/zelotitafapubaron.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/liwoza.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/93174472222.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613414d3e854f---43237747972.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/93122720457.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/61664633674.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/dixovis.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/14479099031.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/46837517936.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/35472399368.pdfIn PDF document text
    • http://vhz.cz/user-files/85767952829.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/baduwatuzabamasojuf.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/sulozewekemixebatezoferi.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/74923073968.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/78241026846.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/90465702293.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/32464766728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=wum+wifi+apkPDF 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_off0000d891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD891 17872 bytes
SHA-256: 9e577dbd19622ca2ff1ef0f2b7bfaba6cbb5f0d3b6adfdd4e0ff94f0d290f6fe
font_01_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 10020 bytes
SHA-256: 4a0138f0a122c2a9cdf122e35f0d86941bef4cb0bd5ecbb88823e8dbfb0348d4
font_02_sfnt_off00011cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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