Malicious PDF — malware analysis report

Static analysis result for SHA-256 480f48cc4238efa3…

MALICIOUS

PDF

70.9 KB Created: 2021-09-12 19:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c6fa72957434570cefc29aadbe72ca1 SHA-1: b56f9810db59f42a8e47b68e15054e787706c1f5 SHA-256: 480f48cc4238efa3c9d7217ede56ba932e643187f26181d13aeb8e439fe566e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates the PDF's primary function is to redirect users to malicious external sites.

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 https://wastran.ru/uplcv?utm_term=coc+plenix+clash+apk+download PDF link annotation
    • https://matfplayer.com/calisma2/files/uploads/leniribusadidakutibeke.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/dolevejimu.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/nufagofulidaw.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/75877068524.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc934a5683---60354323967.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/xeniwapifuvefam.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/87456216703.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/80274921530.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/suruf.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/66085441176.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/kosozufugiji.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/64893445724.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/makokibawejagawapad.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/74289380656.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/48964055619.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/67828932417.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/70906441061.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/84973904603.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/39dac2b1a3e3afa880047f3446b7902b/lutizapivodivumanu.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/tedopivuge.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/17920120000.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/34571671918.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/kiwelip.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/fumegowena.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_off0000b51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51C 15716 bytes
SHA-256: 8ffb763a77e21edf896cbb3f2546f145b22b9f60f5e5e781f254f10137ed4dc4
font_01_sfnt_off0000dcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD1 10724 bytes
SHA-256: 8993dee6928c9d1112af203a643e8d6224d13a08073ddbc03eca2f9ae0936d8e
font_02_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1