Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29a0f5d0b83e691…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 19:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0343690b7904bdea10ba70b541972012 SHA-1: d9c9bcaba2203420a9bdd32e2db1e4537a04918d SHA-256: d29a0f5d0b83e691c7cc72af368bec1090a39ff7f5388e5a63c87cdf12eb8a4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted, but the presence of external URIs is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=omegle+random+chat+app PDF link annotation
    • https://kingyao.com/uploadfiles/files/20210912_050745_9735.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/murigikedazikexotow.pdfIn PDF document text
    • https://beaszemin.com/files/72543607893.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/959e75481b65fe10b559bf050ca0fc79/kemototalosogomugivawiv.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/saxegaj.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/96904280656.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138712462397---saleno.pdfIn PDF document text
    • http://juentai.com/userfiles/files/29669883245.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/nodosexatule.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/zoxajuzakemapanixagus.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/zibezo.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/15866963607.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/xorulabomolepupusude.pdfIn PDF document text
    • http://mobiliteit.nu/files/48511744015.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/66048899518.pdfIn PDF document text
    • http://offerparts.com/upload/files/7840399310.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/tofepamowurarozewanilux.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/11511731178.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/3967772027.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/tatisotix.pdfIn PDF document text
    • http://gojjang.com/uploads/files/lamefibinusop.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/48083984582.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_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 10728 bytes
SHA-256: f87c9f6ff25969739ed36e91755403cf0eeeb7674fc49185dbace3873f8b1839
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DB 17620 bytes
SHA-256: 1cdc6c07ab30cad8ccf293a0bf4c00850b2f2f60ffc60e38c74f56b331be28c3

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