Malicious PDF — malware analysis report

Static analysis result for SHA-256 07dfd03fdf74a826…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 00:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d90f5b27dcfe6634dd7869e53f138b6c SHA-1: 290b4d65bc1b95264c65090b73c59aa8cd225163 SHA-256: 07dfd03fdf74a8267cbcdf442d6595e127cb32c80ab4feb0f5a19ef5bc67d77e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://haciogullari.com/depo/sayfaresim/file/73532821272.pdf In PDF document text
    • https://uleshuzatabc.hu/files/file/kupuxitezenu.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/79051805997.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130f57c26acd---81364365301.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/vovetawobinuxibefewi.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/wiwaselewozekativanalid.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/nezatiwitupukid.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/91499632367.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/pefifobinorezudevutufuf.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/botoxakavokanadevafajuko.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/zetolo.pdfIn PDF document text
    • http://storemisr.com/uploads/files/fivibujekimoso.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613567815a53b---momasosudosofaw.pdfIn PDF document text
    • https://fong-cai.com/upload/files/93629096954.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/58536834730.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/44753049015.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/madulixat.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/43747483575.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/89490106106.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/zawigofevofigema.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/39900164168.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/dupogasavaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pulp+fiction+jules+bible+versePDF 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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 16780 bytes
SHA-256: d1ec0077f1dad842bef8397c499a0f111f948f58584857b0e81054810466a283
font_02_sfnt_off00011e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 10748 bytes
SHA-256: 49bd33fa4c138213f57731c7ed39703331a4f1d62ae55ad77c7a129b5907ccb6

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