Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b041a808bb8ffb…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 10:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5b062d4ae44f40a10c095c7f73bfd38d SHA-1: 3eb8be2d488c2ebcdb99af1b93e5abb3c99ff917 SHA-256: d5b041a808bb8ffb0e37ea8fe24b3559ccdf6895b66edbec76462f95942b0ed7
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 0.9977

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 https://coretry.ru/uplcv?utm_term=cheat+engine+android+tanpa+root PDF link annotation
    • http://wxdyzs.com/userfiles/files/72060399354.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/14712871096.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/40351296762.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/nexinovotarus.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/sesafukiwibozaxosaj.pdfIn PDF document text
    • http://samoinstitute.mn/uploads/assets/file/tenozobag.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210901232852_ldvb8p.pdfIn PDF document text
    • http://hidramaco.com/files/files/45033283394.pdfIn PDF document text
    • http://offerparts.com/upload/files/zaluzekoti.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/tipufezujevifino.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210910080206.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/lasobuwububevaxox.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/senikaz.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/kevatasorodenovure.pdfIn PDF document text
    • https://chineseclothingonline.com/File/tufijanigirabagoxusupawa.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/tetuwaforiwuniniwipibuja.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/92412410619.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/ferufaretagopanexu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613af4fde1b05---76180945345.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161386a87ede3e---nutojew.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/soripokibogotituzijataw.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/65406031232.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/56954300914.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_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 10488 bytes
SHA-256: f1c423b075fb9d0c07e958cd21e8954e81d086cd41b7ef654861f068dfe4d506
font_01_sfnt_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 17812 bytes
SHA-256: d77701ec7dd800faeaac2828d73537213c006cd59f7afddfe1643be9309abf90
font_02_sfnt_off00011e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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