Malicious PDF — malware analysis report

Static analysis result for SHA-256 5606fb53e1771c3b…

MALICIOUS

PDF

87.0 KB Created: 2021-09-09 10:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6914e1e3b67b11ec1dc19d021afa513a SHA-1: 6e00b880630aa594e3a649f33650c596ac019fcf SHA-256: 5606fb53e1771c3bca6af1120568a7ade7ad61aec93acad335cd7bcb3ba5fc06
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 other PDF files, suggesting a link farm or distribution mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for these links, likely to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tuzvedo.hu/elemek/file/duxubamumiwuloxilapa.pdf In PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/32938724055.pdfIn PDF document text
    • http://climtech.com/files/files/9586039470.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/xasixenojunufesibado.pdfIn PDF document text
    • http://haai.org/upload/file/70521051235.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904022010265218.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210909_86E4765618EEC0B5.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/47031726289.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/murugitug.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/16792189655.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/xasexoxuzunuluz.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/netefazefiruzabegoxun.pdfIn PDF document text
    • http://vodnik48.ru/content/file/fugufitasu.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/68058041818.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/kuritixamubuwewilenuw.pdfIn PDF document text
    • https://noventa.cz/media/files/file/80425015401.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/93782894908.pdfIn PDF document text
    • https://domilot.com/uploader/files/77142746081.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b66633e57---23908410669.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/8841753810.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/mokepowegojivisebopa.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/15064068751.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161342ed86d7af---27016599278.pdfIn PDF document text
    • https://begili.com/uploads/image/files/27937981048.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/1442364055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+thinking+games+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_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 17024 bytes
SHA-256: 4268551ee5616de5f7f40d16e567409fdb2cc64a0ac1d9161f07a6b166568efb
font_01_sfnt_off00011dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DA 10796 bytes
SHA-256: 3cd6bb14da47a626702bb3f01dea0e892118ad103303e4a07e44161b8919518d