Malicious PDF — malware analysis report

Static analysis result for SHA-256 04638fa2642776b2…

MALICIOUS

PDF

70.0 KB Created: 2021-10-04 07:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 36320c098f37272629636d5552d1579c SHA-1: 15b5f61a157e169dbe92a74dd3312f487adedd08 SHA-256: 04638fa2642776b25ac94a72fc6ff9868229b235bfa226a985b381e628a1ba3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall detection indicate the file's purpose is to redirect users to 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://associatedreclaimed.com/userfiles/files/51225689522.pdf In PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210904075051.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/66045679914.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5b39ee99---94859490013.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/75730602657.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/6621591698.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/85132753839.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/29887838281.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/19292484969.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/26388019672.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/wupatuminolavuxolim.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/gorofofedareroline.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/siwewojolikoxojozudo.pdfIn PDF document text
    • http://epicridesnepal.com/files/79051182487.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/10753266209.pdfIn PDF document text
    • http://centrons.com/uploaded/file/1446124251615a2b65228ed.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/69282837817.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/rasosanapopuwaxik.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/xabixamojufopef.pdfIn PDF document text
    • https://kimcert.net/E/file/mebem.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/muravifupofakokero.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/wikikoleriwer.pdfIn PDF document text
    • https://mmtours.si/uploads/komoropozisasaveputug.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20814910723.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/gipobawisefedubatemowuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=termination+letter+formatPDF 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_off0000b3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AF 10168 bytes
SHA-256: dd73e948e2e0e0c0602de9639e5ebf3e5dcf6d6f0b92d61aedd1eba1049ef458
font_01_sfnt_off0000ca5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5E 15636 bytes
SHA-256: d21d8355119cb2e44e1df069262a5d853bfd0346daf05344f22e1cc7c64f0f58
font_02_sfnt_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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