Malicious PDF — malware analysis report

Static analysis result for SHA-256 793a89a39ae9958c…

MALICIOUS

PDF

84.3 KB Created: 2021-10-18 09:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9826c5ddde73060d754a9b76ad172072 SHA-1: 90c822c93430584f62667e2924ca22e41e3c95c5 SHA-256: 793a89a39ae9958c9a1362c3d220cd39dccfb9ad83e2e0b7dce2806c351aae32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as a Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malicious content. The PDF structure and embedded content suggest it is intended to deceive the user into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://rugerwafers.com/demo/ruger/beta/userfiles/files/buposub.pdf In PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/65157574325.pdfIn PDF document text
    • http://sergeybazarov.ru/file/retekewik.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/daxepetopukedikosuko.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/90387397369.pdfIn PDF document text
    • http://4darchitecture.org/img/all/6808224132.pdfIn PDF document text
    • https://nexapos.com/upload/files/72083638915.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/40733315213.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/6700963076.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/woduva.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/marisiwazav.pdfIn PDF document text
    • http://ladna.pl/user_images/file/85717722561.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/33403841819.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/jaxogodulivamiv.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161413bdfd49bb---41500328148.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/xopeveferulilegigawiti.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/kuvuzevufupunete.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/30838486391.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/gikofofuwugidivurotes.pdfIn PDF document text
    • http://tencanpowder.com/d/files/18730138708.pdfIn PDF document text
    • http://jawarakreasi.com/file/raxubenoluf.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TSvcnjQ06Jg/uplcv?utm_term=put+her+off+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_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 17468 bytes
SHA-256: fabdbdcd94c3e3e3b6634bf2f172ef31a31cae723fc4b6ecfd6acdf10bab6dfc
font_01_sfnt_off000113d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEB 10548 bytes
SHA-256: 2074fd67b2d1a348d0a59f1e866f62b5b9ea421b85eb09a12aae25787a3f13c9

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