Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb4c62226f7b077…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 19:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4569f6045e4110aca2a141d5365f1964 SHA-1: a31a81c76962eb6d57a0e84cdfebe0af0130ad08 SHA-256: cdb4c62226f7b0777e638726f4feb8cc7300bcc7c264d6d47e4feb1e328a3ac3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=asphalt+8+airborne+obb+download PDF link annotation
    • http://everestlodgelukla.com/userfiles/file/bebutinuweti.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/gajivutumojesu.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/sizulofe.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/87548346808.pdfIn PDF document text
    • http://www.bash.cl/media/file/12707553447.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/mikafakukurimuga.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/7995065263.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/65433456534.pdfIn PDF document text
    • http://teresachild.com/upload/files/jexejapowerogof.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/87367777655.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/taxenefevifi.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/69985549733.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8d149107a9cee6451985d134a8cfb887/90818037063.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/pituzasezodowapiwigu.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/56494856289.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/65347552661.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/weforedatofikuxegomezo.pdfIn PDF document text
    • https://windsbs.biz/files/file/jakolipotom.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/kafivanuriwinedaj.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/wararewakiw.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109161629392284.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/26960648582.pdfIn PDF document text
    • http://come2menorca.com/images/file/defosewufe.pdfIn PDF document text
    • http://proxima-design.cz/files/file/faxeludomasakan.pdfIn PDF document text
    • https://cakkue.com/contents/files/21232295480.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_off0000b387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB387 15940 bytes
SHA-256: dda716d94f0dd3aaa70f8d314bbf07020fe01e80c176131ebf9afc0576d50dd6
font_01_sfnt_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 10904 bytes
SHA-256: 238ce20d0f3b9ba6d57abe711091da8535e3ad00c84b7883742a66f0e1add5ef

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