Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ae5e5b27080f6c…

MALICIOUS

PDF

67.7 KB Created: 2021-09-25 05:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b8e1dbabf746f9d4dc4199c0ff922f5c SHA-1: bc5e5f9651646d528b79e017caa788bf08e87949 SHA-256: 38ae5e5b27080f6c55cddc494c93ef8b16639ebb8ea8dd4c56a96f240f6d00cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, and is identified as a link farm. The presence of external URIs and the link farm characteristic strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

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 http://ky-auto.com/uploadfile/files/30786944315.pdf In PDF document text
    • http://only-svet.ru/upload/files/87400852771.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/wadadepowutile.pdfIn PDF document text
    • http://suurelepa.ee/data/file/13421170181.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/natokodemodidevudaroraga.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/lamuximolotemiz.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/45481923618.pdfIn PDF document text
    • https://norservis.info/files/files/61408485017.pdfIn PDF document text
    • https://argumentua.com/i/file/mogokeginuj.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/gavewuniwulado.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/37232958712.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/2557994090.pdfIn PDF document text
    • https://icbacademy.com/upload/files/27347905624.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/fogavu.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/38431987657.pdfIn PDF document text
    • http://hotstamping.pl/files/file/xomigevipopala.pdfIn PDF document text
    • https://exhibitproplus.epponline.com/mentorfinancial/page_images/file/39627286925.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/22232125901.pdfIn PDF document text
    • http://cartopack.be/Images/file/febewibemimikagusigigadaf.pdfIn PDF document text
    • http://susutour.com/userfile/file/44372642392.pdfIn PDF document text
    • https://produse-zilan.ro/files/gexegafalupibamax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=amazing+spider+man+full+movie+freePDF 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_off0000ab61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC373 14596 bytes
SHA-256: 639a3e724a02f37d3a13443cae98d906024ab34a434401ebb182efcdf434f48c
font_02_sfnt_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 10948 bytes
SHA-256: 1702e8b24b6b1489a78c7c3155714f3c7563bc016bc9a3f4debddc692995984b

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