Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f984b8c1e551c1…

MALICIOUS

PDF

73.2 KB Created: 2021-09-09 16:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9e5b0ddb81eddb083b8df9ae4ece957 SHA-1: 7258eff6c8b1fe6e37cbadd5034df014c3ae55c9 SHA-256: 33f984b8c1e551c19a62ca4e432d000a3c468b8d6dc98e477dcabaf106f74fe7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 https://philabc.ru/uplcv?utm_term=android+sd+card+exfat PDF link annotation
    • https://brincandoeaprendendo.com/fotosempresa/files/38125048153.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-1/20210901150224761464.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/fadoxaferosofisud.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/pozafukabetagujas.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/motisazoxinumovidukojup.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329cf147b41---15250614657.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/xefel.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/mimefudimeketuwox.pdfIn PDF document text
    • http://allasclub.com/campannas/file/remonopasuronefuwego.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/kokebatodibaki.pdfIn PDF document text
    • http://195exim.com/datas/files/24136885673.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/sezemoxele.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/48442874343.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/9803235477.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/56773472627.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/12381664767.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/38814498282.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613317bbe3056---32386560145.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/namuwox.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/ditozojobokanog.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11737620289.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/kikefomerefirafexaralewol.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/23861248232.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/daxopovoporog.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/lunalaji.pdfIn PDF document text
    • https://12shio1.com/contents/files/25331706177.pdfIn PDF document text
    • 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_off0000bae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FB 16832 bytes
SHA-256: 3194c9abbcd36bdc4b8a4ccf7d6c02f08fa2f367754a40fe7fba8a471196b940
font_02_sfnt_off0000fec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 10504 bytes
SHA-256: 3978b4f0afa94855df7e3ff971e3b6221ab0c546a3a5e96c7dc673a17a68c9ba