Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97d222449828cf8…

MALICIOUS

PDF

119.4 KB Created: 2021-09-14 10:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 87d169b818604f2d36d006301cb3a904 SHA-1: 1d9e2b1fcff9c93fa2515524958816b92b3e94b1 SHA-256: a97d222449828cf844205a3f26ebf6e5b7aa4833ade24a40bd861ec30b69c09f
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.pactforfamilies.org/ckfinder/userfiles/files/17583008619.pdf In PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0716aaa16---70712827523.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/54625039708.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/zafifanaguz.pdfIn PDF document text
    • http://poiskvod.ru/images/file/27320921279.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/pupesalelorisaba.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6130AFE4A0556.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/kipiwukutafusebebe.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109121710334709.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/magowufafavoviralobi.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/19262665891.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/22587677446.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/ronudojezuxavavawa.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/wegoluvotelevupurixa.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134473e41d9d---kotaketopirufu.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/fibisaxebuwavaraneliseku.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/wotutunutigogubeg.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/ninilazikamozugan.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae7764844f---90534600144.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/papusidogopusulemar.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/nadebaborirotusivipofem.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/fafefexilanagedegakusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+new+paw+patrol+dogPDF 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_off00016971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16971 20744 bytes
SHA-256: 00fafaab90c8f0b69dcfa1dabad5c8fcf39e8d5d25945adfe89372be4818c61c
font_01_sfnt_off0001a075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A075 10460 bytes
SHA-256: ffa49b2dc49d1fb22b3bd68aae6619499c2d2071562b1df1304adf5394bf365c
font_02_sfnt_off0001b7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1