Malicious PDF — malware analysis report

Static analysis result for SHA-256 6803a7be09856493…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 02:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d27771ddcff591f0c786efa3020cad6c SHA-1: 7615ae4c17fb2f5dbd517baa1e97f52ad7465085 SHA-256: 6803a7be09856493692545bb5c7982d88a9bd2146386ed9fe21532556108e2c1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of distributing links across many disposable hosts. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.culturehousesun.org/photos/file/99263793913.pdf In PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/11177277259.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/85291385354.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/fugipafuwi.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/difuludotixugesisutetel.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/gawaxosemalasesepafun.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/82518952117.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/75811495182.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210914084948.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/75688556869.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/80642220731.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/31112240074.pdfIn PDF document text
    • https://rafautama.com/uploads/file/66475219599.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/37849544906.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/14829074834.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/30696320080.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210913040317.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/14196716644.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e76fa8944---39602997066.pdfIn PDF document text
    • https://fratellifurloni.it/file/kenizun.pdfIn PDF document text
    • http://www.depomatrial.com/file/82132800349.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/lafamozurizum.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161410d796649f---54503795905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hex+file+converterPDF 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_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 18276 bytes
SHA-256: 7f4a14c95b5ad36156e1d13a0021bd62ebd6fb2646154ecc4a1107b814127bef
font_02_sfnt_off00012a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A12 10160 bytes
SHA-256: 5a3d18bb2dca5e2064aa523e60365888801365624183696ff5710fe97083a092

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