Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7075e2ba8561285…

MALICIOUS

PDF

88.0 KB Created: 2021-09-20 17:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 193023468605073f1a2f785f6c1aa749 SHA-1: a095d80669d1f4ce994c56c29e46bed5d3c2b026 SHA-256: a7075e2ba8561285ec4212d9f671ec3ec7abc1c683b301feb1911d929efe4bd4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to various domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to sites hosting malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=enter+the+gungeon+gun+game PDF link annotation
    • https://www.esfa.bg/root/ckfinder/userfiles/files/kifeb.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/12195832802.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/1689160434.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qdhgcfnkmv7u3h6ovm3c583km8/sewexafapobinep.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/pipanabuzubig.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/11f9eb8fb113990a1c05b070f6187d14/68100413893.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/zuzokoroteropodojox.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161397b98acf91---bedupegaliteniviripitif.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/baxawezed.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/5898755607.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/17139219800.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/080453002149.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109062019107354.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/napatebaselowozeras.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-19/20210919184433150197.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/2614126393.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/fisopevif.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/82038463996.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/83359040052.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/nodosexatule.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/xebudixitolinanurazazu.pdfIn PDF document text
    • https://ccskin.com/geektic/files/86370642516.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/39612718149.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/93151183098.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/lenakenoxezofakozeli.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_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 10332 bytes
SHA-256: 54f76dee4c938c9e68c50d0ad1ab30bbae7b9f0536af69a2f33a7999803a2bc3
font_01_sfnt_off0001098e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 18356 bytes
SHA-256: 4d097c67be7ffe3604a32bcf048d03d3e470e793c8938ea3258e0782de2f4ddc
font_02_sfnt_off000139fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1