Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb9cbbf855d479d…

MALICIOUS

PDF

74.8 KB Created: 2021-06-08 11:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 74bac18dfffc75d44a60519f55329c61 SHA-1: b9d5120ffc0530fbb18b0a3e8988aaec8bedebda SHA-256: 3eb9cbbf855d479d19bd0ac29fa90582be1962fa65c0b6456c9e5e11404b7666
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 0.9996

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 https://ponafet.ru/123?utm_term=battlefield+3+launch+trailer PDF link annotation
    • https://kigumafu.weebly.com/uploads/1/3/4/1/134131380/8743901.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464870/normal_5fee94c6f2fbc.pdfIn PDF document text
    • https://gekipedagap.weebly.com/uploads/1/3/4/7/134750311/bovuso-mumus-pidefidamisired.pdfIn PDF document text
    • https://bupudotededifo.weebly.com/uploads/1/3/5/3/135323991/zibanigivimokog_kiwubewulipe.pdfIn PDF document text
    • https://dadojunolibete.weebly.com/uploads/1/3/2/6/132683289/dijesikupoju-fafopozog-vezetolizo.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387243/normal_60b569b66c6d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_6041ec668f67a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462073/normal_600f57ecacad4.pdfIn PDF document text
    • https://dakuxemi.weebly.com/uploads/1/3/4/8/134883968/tuvuwaniwunexa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382189/normal_5fe5e502a6977.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://natutaliva.pbworks.com/w/file/fetch/144681489/english_translation_of_o_del_mio_amato_ben.pdfIn PDF document text
    • http://pevozowo.pbworks.com/f/nidur.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/gta_san_andreas_apk_data_mod_for_pc.pdfIn PDF document text
    • http://nemupaludol.pbworks.com/w/file/fetch/144728706/94044530648.pdfIn PDF document text
    • http://lipovosufuk.pbworks.com/w/file/fetch/144836541/vaporeta_unitekno_703_manual.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/f/fuxuwifarulita.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/f/voteredosusipotil.pdfIn PDF document text
    • http://wefolevemud.pbworks.com/w/file/fetch/144741723/how_to_trade_one_crypto_for_another_on_coinbase_pro.pdfIn PDF document text
    • http://vamafob.pbworks.com/w/file/fetch/144827583/jujadoxikejefevezarasef.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_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 5144 bytes
SHA-256: 21f3e94fd7179d40d8df395cd41ac675e634974cde8dd93c621b2a0bab9e90c5
font_01_sfnt_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 10584 bytes
SHA-256: 0db80dde405f4ca5c77157562e11e248a6bc80882cfb69d77cf21d43365523b3

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