Malicious PDF — malware analysis report

Static analysis result for SHA-256 f785e17cb6455cc8…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 19:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 96d05d5e490da029003f8fe0a5795cce SHA-1: f5fce5cfcbe019b4f4ee761e22d916c6a1dfc573 SHA-256: f785e17cb6455cc846b8b0da9886b21be82566a16897bc2a96f05efe51f272ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs, many hosted on potentially disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the presence of many unknown URLs indicate a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://klusjesindex.nl/images/uploads/godibigijegudosoraken.pdf In PDF document text
    • http://uforoi.com/app/webroot/uploads/files/29087238013.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/dibosuvojarixosaviposo.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/ganapitafoni.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/34440780084.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/455737781.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/menusizoramixusuxeruvulo.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210906_000330_6204.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/zilozejigixamagemupes.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/77188226612.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/43206789887.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d5e17603---92247671397.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/d4499596679ab4f87b3353c5d83211b1/28201371064.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/bugevikosopudar.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/vafelazajigixudoza.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/23493849230.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/dubofu.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/48470700734.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/pebefopazirakedafunep.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/31058442014.pdfIn PDF document text
    • http://grabnerestriche.at/33097358044.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/79524752592.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/5389340781.pdfIn PDF document text
    • https://purefeeling8.com/data/file/fenopeverererewotoxovugi.pdfIn PDF document text
    • http://prosquash.by/data/33057688738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=upgrade+my+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_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 17308 bytes
SHA-256: 5caacbac5d0b07233f3ab90d4206ca51d504a144f6bfd1272d29bf42b3224aae
font_02_sfnt_off00012088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12088 10544 bytes
SHA-256: acd0b76ee498c599633523e41ca747f644927b39fa664feb00dd95094029ad3b

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