Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6af0d5d466d2839…

MALICIOUS

PDF

76.1 KB Created: 2021-09-11 09:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9fa63d3faaae52e8333e6ee797bbc449 SHA-1: edee1513f05396955675797663946583f49c82e4 SHA-256: f6af0d5d466d283978ee9165fecaa156f8140dee4f518bba29a45079d246e4b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to external PDF files on various domains, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the interpretation of this file as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vitalenzyme.com/uploads/fckupload/file/regigitojakepit.pdf In PDF document text
    • http://deaprogettazioni.it/userfiles/files/15468817782.pdfIn PDF document text
    • http://agavietnam.com/img/files/saroganorasajavoxaz.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/jegibet.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/9817828613.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/47021263475.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/62090268397.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630518454.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/tebimatusidovolafi.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/dimar.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84828482944.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/tekanabifegeroxaxopiwin.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/23712306134.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/didikobatogegupe.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/gajalorevozodirepiwe.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/14528891434.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/gurutadexikogininono.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/dezokufarosar.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109082102124628.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161325a5833413---83577507300.pdfIn PDF document text
    • https://rajakedua.com/contents/files/95472350965.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/3805743161.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/95961646924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=lord+anjaneya+ringtones+teluguPDF 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_off0000c0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D3 10724 bytes
SHA-256: 36f2f92ecc0001aca24d2df1cb6d5a45fe42c2a0acf71807e470966e18389a85
font_01_sfnt_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 18560 bytes
SHA-256: c7fdf29d15d9234c67c65a2a547f6afd6909fe07bc93ae059cbfcb02f17e0bd1
font_02_sfnt_off00010aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1