Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f20136142476ed4…

MALICIOUS

PDF

78.3 KB Created: 2021-09-26 11:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a23c55899c7ad2992f709c3d49753f4b SHA-1: 170d9ecaa5029ad4f15ab17914677f156ee89af3 SHA-256: 4f20136142476ed4f6402f93fb7be87e5c5eab5e6d645bee348ac4e92b80d4f7
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. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable domains, suggesting a phishing or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of numerous external URIs and the nature of the heuristics point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://hw-power.com/uploads/ckfiles/files/6138fc3bd105c.pdf In PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/56003300782.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/67803879311.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/74684967257.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/dedur.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/45808042299.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/73156562232.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/47183230568.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/deborejega.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/vivojejaforesezawuj.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/vokufekabusudasuwewo.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/8114036442.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/kepozekekawajodafepatugux.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/52064ff85b2df791867489aaefe7ee63/29747308423.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/zefikezitorexitime.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/80806891593.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/lupazukibitebod.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/65541727969.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tadewewigavu.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/41377907509.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/57861162349.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/71611629448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=vishnu+sahasranamam+lyrics+in+kannada+with+meaningPDF 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_off0000c34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34F 21136 bytes
SHA-256: 2b39cbb0bf33d6a78e01f433b6e88c7fb48c5a40d8cd65702097471ee5560edb
font_01_sfnt_off0000f9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 11060 bytes
SHA-256: 04bf8d918516e3f50051b27a35d9e0eaefdebb658ad5629a801f638972da9799
font_02_sfnt_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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