Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f07815a90d3e102…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 23:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0fc3f3f8ec2ccad50df91df3053652ca SHA-1: 217737895ecc200726ad71164dbea0f311b33815 SHA-256: 4f07815a90d3e102f15fc377ff40ccba666c0573633ace3f62fcaac5da680e8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, suggesting it's part of a phishing or link-farming scheme. The presence of embedded JavaScript, though not fully detailed, further supports its role in potentially executing malicious actions or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://archism.ru/uplcv?utm_term=vpn+telegram+group+link PDF link annotation
    • https://kuwaitpolyurethane.com/ckfinder/userfiles/files/65619621573.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/85777266255.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/93961767883.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/mafezemazebitubemazawi.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/2597211886.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/movaraxileribug.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/12487015958.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138158d746bb---tikobarirufugenokiba.pdfIn PDF document text
    • http://innotack.com/userfiles/file/nulemenolibavox.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/39968746777.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/benulujegagekevafe.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/2698906935.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/telumulapifuxe.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/91197701632.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/94052277136.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/tisegivazokereviwiwijinu.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/bazilizijixos.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/zewabozadijozufujazurosar.pdfIn PDF document text
    • http://classtool.info/upload/files/fogabalubozenanumeda.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeb4d7b93a---82226622268.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/28675038125.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_off0000b55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55C 18656 bytes
SHA-256: b469e0c0412e582d91df04b07cdb9e948a8a7e42d146300c7b17bcbf1c84b3fc
font_01_sfnt_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 10588 bytes
SHA-256: 13fbe50bae1c86cab85f0ea8c3442f7fc0cf6a8df13e6b4fd087fbacc8635075

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