Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6591ae522f174ab…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 11:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9b82a43f744449a3a19abbc9d3fc0ce SHA-1: c0f0a79bafea683d46f297ae26dde870f0701f28 SHA-256: e6591ae522f174abbe2355d5a65f681f2e1e9475554c563633d27bcc7ef628b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to various PDF files, suggesting a phishing or SEO-based distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the link farm heuristic strongly suggest the primary goal is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://fertilizergranulatorprice.com/d/files/45370819064.pdf In PDF document text
    • http://nazycakes.com/userfiles/file/22151001757.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/xipejujagisemuzu.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/12529148484.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24c0d3cba---japesunozegi.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/39549232423.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/betuf.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/movasejojapinoxa.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/66877482532.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/xixafufa.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/marilimebisuwunisiduluvaj.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/latejefo.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/dagimuwetokeminukuri.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/18101890766.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210915171313.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/77822621667.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/15831492387.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/41986432298.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/46710261076.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/gojulowumef.pdfIn PDF document text
    • http://termocity.by/pics/files/xawewara.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/80085040307.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109131318202373.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/jowarametararina.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/50122692896.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/tegexajawoxoxolulifozifo.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/18237835894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=galaxy+s8+vs+iphone+8PDF 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_off0000d03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03F 10680 bytes
SHA-256: 984827981bb00c6f83fc810926a4b7bc77a83a6656db80dbe801f9dd6d445a61
font_01_sfnt_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 17752 bytes
SHA-256: 9d8cfe342f26e2a014106965cba25efb1b5a8bda786bbe23d4a4468a4d9984dd