Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a691c532e108eee…

MALICIOUS

PDF

77.1 KB Created: 2021-03-17 23:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 633de13c1852a73f893f5fa53f4e9598 SHA-1: a936ba90303839e651a855b8a854d700174dd974 SHA-256: 7a691c532e108eee9193bb770723824607589c2aa2f381521d7e47fbe29e72ac
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://dugedepap.ru/aws?utm_term=bersa+thunder+32+acp+review', is likely part of this scheme. No scripts were extracted, but the structure and numerous external links point towards a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/aws?utm_term=bersa+thunder+32+acp+review
    • https://static.s123-cdn-static.com/uploads/4465000/normal_5ff155360c3be.pdf
    • https://static.s123-cdn-static.com/uploads/4483104/normal_5fe3955e8acb8.pdf
    • https://cdn.sqhk.co/rivotoxupow/Yn2gjja/farming_simulator_2015_argentina_mods.pdf
    • https://cdn-cms.f-static.net/uploads/4412758/normal_601fd3bdc30de.pdf
    • https://static.s123-cdn-static.com/uploads/4491169/normal_5feb6f6ad3d21.pdf
    • https://biposekiz.weebly.com/uploads/1/3/5/3/135349949/2912220.pdf
    • https://xovirekines.weebly.com/uploads/1/3/4/6/134648888/kumozun.pdf
    • https://cdn-cms.f-static.net/uploads/4452398/normal_6029ae725c7c3.pdf
    • https://cdn.sqhk.co/raguwubives/gEgxs0S/merge_racing_2020_mod_apk.pdf
    • https://wipugetawunuw.weebly.com/uploads/1/3/5/3/135302850/wujenubizu.pdf
    • https://static.s123-cdn-static.com/uploads/4451230/normal_5fcf07c280302.pdf
    • https://vojerured.weebly.com/uploads/1/3/3/9/133999986/bawimowevi_lapagu_netaju.pdf
    • http://salonapp.xyz/pitovorenifafebakek7x5b.pdf
    • https://zalajugimawif.weebly.com/uploads/1/3/0/7/130739284/1678152.pdf
    • https://cdn-cms.f-static.net/uploads/4403129/normal_604fa52167abf.pdf
    • https://cdn.sqhk.co/wavafinudow/QFliiih/azur_lane_jp_apk_mod.pdf
    • http://autokenn.com/which_is_better_chromecast_or_rokuhyjop.pdf
    • https://static.s123-cdn-static.com/uploads/4495039/normal_5fcc36502b5f8.pdf
    • https://cdn-cms.f-static.net/uploads/4498348/normal_600f5dbcae151.pdf
    • http://bristol-yalta.run/4476070572cwzj3.pdf
    • https://nulebuset.weebly.com/uploads/1/3/1/4/131411431/9443f0a.pdf
    • https://static.s123-cdn-static.com/uploads/4365659/normal_600803e4304b2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee7f.bin
7c30d465622a66e575c8e648fe05f67fdbd23457c019248a8f466174f9b8c656		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 5624 bytes
font_01_sfnt_off000101b0.bin
bc3080114736277a33b4fd87faa6792098a5cc17111a9273d79fdaadda055712		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 10768 bytes

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