Malicious PDF — malware analysis report

Static analysis result for SHA-256 be87d25e97c6f73d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 10:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e46d1346e0236686cb13f72e417a7be SHA-1: 8e994838e53d8de6b2e24913b40131f9f776b956 SHA-256: be87d25e97c6f73d732e15df04ad016b33ac1dc086c9ee810eedf249facb644d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The PDF's primary function appears to be directing users to a collection of other PDF files, likely for SEO poisoning or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://kramor.bg/userfiles/file/73070985368.pdf In PDF document text
    • https://szallas-karpatalja.hu/upload/45728115157.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613289152189e---77599217365.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/99005419140.pdfIn PDF document text
    • https://paradigma.bg/uf/file/pekigonoluxatibul.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/kasejimetejawodomowuga.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/vofer.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/61306237713.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/98799901051.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/29385468365.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/98864410145.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/jezenakapewemus.pdfIn PDF document text
    • http://charontrade.hu/data/file/nazagawuwoxafuvajadujir.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9adc684a---67780177200.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/97320844592.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/nubemeg.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/wifovajarasezorogujugok.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/laxazoranozipasev.pdfIn PDF document text
    • https://bselink.com/userfiles/file/17604185524.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/36421478103.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/didexeg.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/vesuwojugositigi.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/zeluvipopukobovid.pdfIn PDF document text
    • http://vswet.ru/f/susojaxuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=crash+team+racing+isoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000def5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF5 10660 bytes
SHA-256: 115e6bf82acf05b426bae06ac89d5c5a5a06b234586fe91508eb53e25bc5f1dd
font_02_sfnt_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_03_sfnt_off00010cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC8 20844 bytes
SHA-256: 5906864ed8ea671854fd60624e85be82d91b6a1146983b048e4c2678f599fae5

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