Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b29b3b35f0f6e43…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 21:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8547895a429fd6a1487ae20eb0cf637 SHA-1: 67a5e031fbf9d1902759fa168c600ccc65e820b2 SHA-256: 9b29b3b35f0f6e43e3d8ea1337d400af58ed5e800ef580437d8d01ba46cd908f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, with one URL identified as potentially disposable hosting. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for malicious actions, such as redirecting users to phishing sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ambient-interier.cz/files/files/fadupibezakexevurapana.pdf In PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/tebalupiludu.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/mufilozumugimiginokatu.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/54518100705.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/wusexifawobumedimanebu.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/fikufowosamubisege.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/27500541762.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ecda9c7b223c74602357b24a56789245/tipejutipawizazofizugev.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/89703759749.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/xubemoge.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/bewabikakabasaxolisipo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd4b1b9217---37714143188.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/18121043201.pdfIn PDF document text
    • https://ijp2.com/contents/files/sisonufun.pdfIn PDF document text
    • https://eclearusa.com/images/file/xerawakikepizumibirapev.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/mebako.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/tesuturapokipimaraloxaf.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/71288519487.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/lugebadivosifewoloz.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/46954276181.pdfIn PDF document text
    • https://upaspor.com/resimler/files/21852624292.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/xunuromasi.pdfIn PDF document text
    • http://baove247.org/upload/files/59573328934.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/nikuwuruwimanovosekib.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/52821321305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tavole+disegno+tecnico+pdfPDF 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_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 17136 bytes
SHA-256: 414f1ef916be7e78e6b78444c78103dd0fe1c849542f069247e32fd127a81282
font_02_sfnt_off000129f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F4 10724 bytes
SHA-256: 8a3ded33b6cb3f3826adc619d96690aff74f456a70d059e644cc83c7ebe2c319