Malicious PDF — malware analysis report

Static analysis result for SHA-256 145f07eca327ca03…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 11:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 720b8a76b086ad9783cf66d0017cff11 SHA-1: 486502b1df3042095c16876e2405ffec3b63c94d SHA-256: 145f07eca327ca031681341b1d2f6fd5144fd6ae0bdcb8bcf5fa19eb17669b6a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the document is part of a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=dead+or+alive+4 PDF link annotation
    • https://coombs.gocascadia.com/images/cms/file/tajipitogugarevex.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/tobufodagugategepanarukig.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/gixitaxed.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/81595318822.pdfIn PDF document text
    • http://apart1day.ru/file/sivajilodub.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615734b4e858b---norojimazal.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/kowepesu.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/gubonategepamodopepamab.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/zorepuvenivapuxitubel.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/fc30be874e386940b39a64b0f198f0e2/giwituwefopiruxa.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/gipadujopibepemegerag.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/lanusafabodawexuge.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/napuziliwerejumikegi.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/rexenivibagikubogaxano.pdfIn PDF document text
    • http://tattooindex.nl/images/uploads/torelavikukuludimip.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/mafefujakal.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/ranogukagibiz.pdfIn PDF document text
    • http://kisito.com/userfiles/file/71838340181.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/viforojejusuvobazag.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/33999611749.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/52902251755.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/1724520616.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/rixukulawujemoto.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_off0000b186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB186 10016 bytes
SHA-256: 347fea7bdbeca1f791cb0b1d1ab779f66fe7564b73f41c0cdc51312a78443882
font_01_sfnt_off0000c7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D4 16248 bytes
SHA-256: bdaa8ec73e83934c6f2106a4c9568f37d5e8045abae3a5aaa4856e677cd26ec3
font_02_sfnt_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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