Malicious PDF — malware analysis report

Static analysis result for SHA-256 a834ca8c59826028…

MALICIOUS

PDF

127.0 KB Created: 2021-03-20 03:10:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0066862030d617161e8c040da6f6b279 SHA-1: d9fe2c082015e8abe6c8f3ae8b7ee162aa1d3b20 SHA-256: a834ca8c59826028880acbf18ff56504f5069fda1686c3d856439affa534bbc8
134 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, one of which, https://mezovuduw.ru/award?keyword=obligations+and+contracts+reviewer+philippines+pdf, is likely the primary lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links, suggesting a broad phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://mezovuduw.ru/award?keyword=obligations+and+contracts+reviewer+philippines+pdf PDF link annotation
    • https://cdn.sqhk.co/mezutorixo/iiUjfhd/jikekaduvexoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_602ad03c2293a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420238/normal_60346e42d8aee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450896/normal_6021895e1880f.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/S0Zridv/24691544422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_6028310039bbb.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/Uib3IHI/today_s_news_herald_obituaries_willoughby_ohio.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501993/normal_600727683ba89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zesixefe/tagegagewipafopuref.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4acbaa91-c782-4439-b2d1-bf9842ce5216/wutigebem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/429ca3eb-c93e-443f-a476-3c35594d42c0/how_to_lift_heavier_weights_bench_press.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/3d_animation_books.pdfIn PDF document text
    • https://fa3f2985-242d-4a4c-93c0-6adbfb259eaf.filesusr.com/ugd/8dbe7a_3eb9f8d8aacb4f7d9e639084455b6bc5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luropiw/the_count_of_monte_cristo_book_number_of_pages.pdfIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_98efcab3831445d1973e760938716420.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efadfe3a-43c9-4c35-96ea-e2557599d2da/graphic_novel_vs_comic_vs_manga.pdfIn PDF document text
    • http://wesufonezis.epizy.com/88731730926.pdfIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_f6ff0fca74b245ed93139197535f923d.pdf?index=trueIn PDF document text
    • http://zifasodokid.epizy.com/17204721581.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1D1 5736 bytes
SHA-256: 60bf939062d551079628f13766278f42bc0b911642a09249487ae5fe54e1441a
font_01_sfnt_off0001c563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C563 11268 bytes
SHA-256: 79415876893ead5c176a960cb526badf3358066418348290a62396ddbae49ebe

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