Malicious PDF — malware analysis report

Static analysis result for SHA-256 2146424390a7efd8…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 17:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4eb6425b890830d55719b7afa8012fc SHA-1: 86c3ac2b2135a0b11236cc34483bb8eebfbf3271 SHA-256: 2146424390a7efd81bf8ce821470e82ac2367bef8da797b9ca927bb1bef8d927
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sun-green.de/ckfinder/userfiles/files/sijejorakubovafupujax.pdf
    • http://progettogeometra.it/userfiles/files/82724182231.pdf
    • http://pribatu.lamilagrosaimport.com/images/files/jadunidado.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161416a77d9e4c---sofafetozinekijuri.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161400ac00bb10---jegifomef.pdf
    • http://fishingas.com/userfiles/file/murukebimufemi.pdf
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/77223023532.pdf
    • https://patriciobanados.cl/upload/file/
    • http://chinalabware.es/d/files/zivijeg.pdf
    • https://marupyara.com/fotos/userfiles/file/bumapilup.pdf
    • https://binarbaid.com/public_html/userfiles/file/mesasepuxozuleduvorum.pdf
    • http://neodermclinic.com/file_media/file_image/file/31056579206.pdf
    • http://bige.vn/uploads/userfiles/file/lerivitasorabug.pdf
    • http://mdsalon.ru/img/lib/file/woxasesuwir.pdf
    • https://jasz-pap.hu/UserFiles/file/nipifajelej.pdf
    • https://bevillelecomte.com/ckfinder/userfiles/files/13027933193.pdf
    • http://candientushinko.com/images/file/fefazi.pdf
    • http://psycare-spb.com/userfiles/file/lasiwik.pdf
    • http://vinhhangvien.com/upload/files/57666210326.pdf
    • https://jck.ro/userfiles/file/8098951436.pdf
    • https://producedepot.us/userfiles/files/4541544689.pdf
    • https://ita.kru.ac.th/ckfinder/userfiles/files/vawabewukubuzux.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=s912+android+tv+rom
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC3 16792 bytes
font_01_sfnt_off0000d4d5.bin
3f5d41bbda99827375d15d63a3a508ea15d9c5dbc69028d8bf91600495a8fcc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 18252 bytes
font_02_sfnt_off00010457.bin
545395e0023dbdb9ccffa022a94458aeec6c63b3eba7694d4703f35d25036640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 10544 bytes

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