Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf268a5d524a608d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 15:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c8590d28aa47f31a33ed9d0c535a5c1 SHA-1: 1233a6ab473ed91ca56686ee0e7c5087e0a6cde8 SHA-256: bf268a5d524a608d3beea35918bd8c3045c6d8dd0ed5c50e2f2be4291d97dbb4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The document's structure and the presence of multiple external URIs suggest an attempt to lure users to malicious sites, likely for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://smidgel.ru/uplcv?utm_term=how+to+run+android+apps+on+pc+without+any+emulator PDF link annotation
    • http://onlytech-tunisie.com/userfiles/file/kusixaxifafizozuvaza.pdfIn PDF document text
    • http://tipiland.net/upload/file/gebopazuxorasidaxadonope.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/1960546895.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/tikigaxunoniwojobolano.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/tolipaze.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/87641970713.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350b9ab41d9---40732936899.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109132021482572.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/9213701104.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/2349989279.pdfIn PDF document text
    • https://anfauglir.com/images/file/wavefivekevojojapikiz.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/nupaviwinalipida.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/20467619569.pdfIn PDF document text
    • http://etre-belle.su/images/file/vuvewipajaridozasolujas.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/nivurolewetugugulirazuju.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/90108210113.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/15/35888206189.pdfIn PDF document text
    • http://brukbet.com/user_images/file/winodotu.pdfIn PDF document text
    • http://marketingnews.fr/images/file/lipeginanenutonexi.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/nibokenu.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/54510943527.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/90794423617.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/55000015130.pdfIn PDF document text
    • http://spharma.ua/files/file/50571834830.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/lsirr1k75ki7ct87eemcmc9q7d/26255130886.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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 11072 bytes
SHA-256: e1e8587cf0749522d4118caaea45d24f53d033b8088dd1961bb61ce9e2abb15f
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 19052 bytes
SHA-256: 90c58389a2f30a0b3141cadb0743ef11f49af716a343a11f6f45873b3ee9e7f1
font_02_sfnt_off00012567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1