Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0a42daad145f2a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 19:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40f8bdba37ac42e6f4c2ba1a8fa9f8f8 SHA-1: fdd7615ca6558ca5beed36cea1ee16648785cb95 SHA-256: 8c0a42daad145f2a46e4419f4e672fbb32f315f1d2f5a1c88971ecb2ba66f04a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of many external links suggests the document's purpose is to redirect users to potentially harmful sites.

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://catamma.ru/uplcv?utm_term=inshot+pro+apk+download+free PDF link annotation
    • http://azizolace.cz/images/file/55948006553.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/ruxamesemuv.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/98292529695.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/kapos.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/rovenutixisurovafine.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/sefebitaxebuwi.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/mivinuwezoxises.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/79186031242.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/ladirovogomixujobi.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/waduxetuxuzanefazog.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/83821628778.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/xumewumanefonow.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/nesigowiguxo.pdfIn PDF document text
    • https://negaratoto.com/contents/files/rizeverozulekuzos.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/99550984800.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bcec5f626---58469238528.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdaeae4795---60180392816.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/45995597287.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/36893764803.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/kesenojobanedefilabodi.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/budogizigufubaketon.pdfIn PDF document text
    • http://nessium.net/userfiles/file/9816424958.pdfIn PDF document text
    • https://equalland.com/uploads/File/26118427936.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_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 17804 bytes
SHA-256: 5ddce42887a7a25a647153ec6aa0fa2ff9f0f452835e8a438dfb9395db32b0ea
font_01_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 10632 bytes
SHA-256: f131ef138454f68dc70651ea98e6cbc4730fdfaedcbe14060399aee4ee48847e

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