Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ba7300fb9c55ed…

MALICIOUS

PDF

82.5 KB Created: 2021-10-07 23:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01f9375ce023b249535e0fcbe853e973 SHA-1: 2c57afc5aee06b9cababe7dde7c20be0ae767ccd SHA-256: 10ba7300fb9c55eda3d978713a2cbb9a789ab42082cd60066491a230bc4d10bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting a high number of distinct hosts and links per host.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=the+sign+says+long+haired+freaky+song PDF link annotation
    • https://mabuksusu2.com/contents/files/lewagaziledikalawal.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/64730083239.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/41411163019.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/81761765640.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/76988833724.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/10338987964.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/31583983228.pdfIn PDF document text
    • http://cmtsport.com/pliki/sobonabozubivebivew.pdfIn PDF document text
    • https://birotex.rs/images/files/kagumogixalos.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/881ce5c33bf7bc02a88c3aa3dcdb4182/wazefawiv.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/tigezerenotudowawoj.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/52106100384.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/19317508862.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/xofumaluguximen.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/84882338838.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/62212248114.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/wakenakuzilabozogolo.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/43880288027.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/pawuxodogajovasofim.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/buxarobifesasetabapiraj.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/82985629717.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130733613bad---wojezuva.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/wajuk.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/rurexe.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_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 10704 bytes
SHA-256: a5d1859050ea19ef313461206272ba436c103bbf9198c33c549e2ecda9bc60ff
font_01_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 18588 bytes
SHA-256: cbef3ee74fc535af6ebd9249334968fae1609efd1e320d81fc3a6571ac0fe833
font_02_sfnt_off000123f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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