Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0b4eb224721931…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 08:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5c1bf8760f7438b38b6f2e853fc7434 SHA-1: 29f1aae3b8b1a1f9602ab5f2acd733e2e94a14b0 SHA-256: 8b0b4eb2247219310c379ae194a58d1a93dd6ada8655f82cd302ae6e14586e84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or redirection mechanism to potentially malicious sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating the PDF's primary purpose is to lead users to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://queure.ru/uplcv?utm_term=the+king+of+fighters+android+apk PDF link annotation
    • https://basisangka.com/contents/files/denemukovagamagujade.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/8330376034.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/vuwinaxiwe.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/km400c3qr1044q5mja6j9mhli1/dotenovogitire.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/81908447769.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/tunaxoz.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/46147752875.pdfIn PDF document text
    • http://minipit.com/data/files/zubepafoforukuba.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/80778539814.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zijumirujivod.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/40007592160.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/54023653108.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/sebeto.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/8911962200.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbdbfa8cb7---gupawusarezofotirelenev.pdfIn PDF document text
    • https://buyafranchise.org/files/files/xuwakefexo.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/kekegok.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/94141363538.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/46997991678.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/napajinuwo.pdfIn PDF document text
    • http://sartor.ru/upload/files/99972524077.pdfIn PDF document text
    • http://topstec.com/d/files/40012791833.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/fitasikutubeku.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/kixugisaminewineti.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0D 2088 bytes
SHA-256: 4e505bdc75417a0423aa94f2ea9d7caefed8569539c42deb95052d8a799f35c6
font_02_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 10784 bytes
SHA-256: fdf348613fd6fa3e3c63de96b23589ab66126c5915f067f3815fd10b3b9ee038
font_03_sfnt_off00010f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 18088 bytes
SHA-256: ff49d8232dce842f02ea3506dcbc93ae76d3d02966f0c6f93ba277e441981e54