Malicious PDF — malware analysis report

Static analysis result for SHA-256 05df2b92d531466d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 07:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7459f8fbaa25adfa13a839269f4b320e SHA-1: 293bc17e2f7251c6485be6e858ad31291eb5446a SHA-256: 05df2b92d531466d6920b75298a59db9ba4b843cc669cdc6274d199b1c81a743
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that point to a link farm, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, highlighting the use of disposable hosting for multiple distinct links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://siblom.ru/files/upload/file/guzanolataluzubuwodutag.pdf In PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3ae13fdb0---rudim.pdfIn PDF document text
    • http://www.juthamasclinic.com/upload/finder/files/42715477826.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/vunimemafobabagejunebek.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7e31e63ca25fa83ef8b042f2f45b8f14/tumagekebidixukogex.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/77569594688.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/34148076731.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/dogibibeda.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210906170304.pdfIn PDF document text
    • http://vaynhe.com/upload/files/43989909688.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/xetelekidufetadebalod.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/dexazuruvulomudazi.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/jepaz.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/tibedu.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/55486949033.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74645034840.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/98522467802.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/bawubibamirefero.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/numibegirarum.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/wemuroxesebop.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/37042867953.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/23056992213.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/58409924317.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/lowelotubusawigujelulos.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/89174358088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ds+emulator+androidPDF 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_off0000cbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD4 10508 bytes
SHA-256: a289a13125f035a3cf67354fca92bbee313349552509d029f90e3eae9e5c7116
font_01_sfnt_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 17420 bytes
SHA-256: 39bca00f7a2d983ef0ed5237d3770cf635391728fa87a8a005a8e0da4cf1387c

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