Malicious PDF — malware analysis report

Static analysis result for SHA-256 8323ce30a9a65993…

MALICIOUS

PDF

76.5 KB Created: 2021-02-21 16:07:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 50b12b2399a0f2c0a6841a90fb950df3 SHA-1: e8ce8dededfdd012a6c361b5f99be1523e1f60dc SHA-256: 8323ce30a9a65993bf0d1e5a7e2b5dc0ef29ffe1aedc546ad8b695d6e644a8c5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=how+to+use+song+select+with+propresenter+7 PDF link annotation
    • https://cdn.sqhk.co/bozadukopufu/4ieKgf8/spiritfarer_wiki_stanley.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495973/normal_5fc7f834df545.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/1275819.pdfIn PDF document text
    • https://cdn.sqhk.co/tubawonidas/gZYozic/vofuko.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/hz9jfjb/survival_island_island_survival_games_offline.pdfIn PDF document text
    • https://fusidaxeda.weebly.com/uploads/1/3/1/4/131453850/telelirukuvavazakuda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443344/normal_5fe8dfc1185df.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/a3230297b46.pdfIn PDF document text
    • https://wugedelujexot.weebly.com/uploads/1/3/1/4/131456191/9098609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408172/normal_6015b69fed435.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bexawiturefu.epizy.com/4940601803.pdfIn PDF document text
    • http://tirevotijo.epizy.com/piwusoxizolutagosexunil.pdfIn PDF document text
    • http://lepevalir.rf.gd/79934514262.pdfIn PDF document text
    • http://ratazudawi.epizy.com/zivugusanotevifawowageno.pdfIn PDF document text
    • http://jivemewogipalen.rf.gd/lol_guide_jinx_counter.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/cumulative_update_for_windows_server_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/3d_building_hd_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/tigavejezu.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_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 5116 bytes
SHA-256: 40f629678d03af2e518f06cff16d6c949479d9e5a000b9086aa7d858fe325244
font_01_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 11020 bytes
SHA-256: e618bc6ce0c55a364aaeebf2f19412c779caeee965c20d3e09f21f1458be73e8

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