Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8625abb583218af…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 14:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 383d9d59df2d4b489af7604dc5c08aa3 SHA-1: aae1b82657b8ea79dc9c370841f0736e68d7b85f SHA-256: d8625abb583218afbb0f9cd040594ee10db8a7fa9c7a5c21a7014d27a7db636c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs indicate a strong attempt to direct users to external resources, likely for malicious purposes such as phishing or malware distribution. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://cjmfgxfollow.morefriendship.com/upload/files/xujanukasipe.pdf In PDF document text
    • https://stiglic.sk/userfiles/file/televatujokoborasifejet.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/toxegusosijixesigidoma.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/82297509323.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/bumininot.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/relovedete.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/89254281869.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210909051755.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/liwomekagiguwapexuzawoba.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/wepokewutemutopovamidele.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/9596385234.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/kowiviratuliwamozono.pdfIn PDF document text
    • http://pmke.cz/pictures/files/basuxabipofajex.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mibivipilugetuwusuvadil.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/40176456218.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/xugunobevebapume.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/pononu.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/83487969650.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/muduxadapekitulofena.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/51538448101.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361cc70bed8---xevumowaduxedok.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/biwokoxoz.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed93cddb96---sidedadamupezom.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/sudupaxejaxe.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/resesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=el+cuerpo+stephen+king+pdfPDF 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_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 20200 bytes
SHA-256: 19429f4f3872880afbae072be474c2f57fef3249be0e2edba3f3f2907d168fdb
font_01_sfnt_off00010e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12662 10912 bytes
SHA-256: 8d6691a9460edd971f26fd9ad45ea4633cbc8e8c28da07080b00f9a84f568e39