Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ae6e3842b83e03…

MALICIOUS

PDF

87.0 KB Created: 2021-06-07 09:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7fbeafe598d687091d0bcc0c42ee5a57 SHA-1: e7db23ed5af10dd13899f406d1e0a35e02addbde SHA-256: d4ae6e3842b83e0387c2ace371b9e2b5f71deb23745e4448e477a386c4d41489
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

Heuristics 6

  • 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 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.
  • 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://ketchas.ru/pbw?utm_term=american+ways+to+say+hi PDF link annotation
    • https://zudimawavisutet.weebly.com/uploads/1/3/1/6/131606198/kowisijupus.pdfIn PDF document text
    • https://jodonorinomudo.weebly.com/uploads/1/3/4/3/134316483/dc72c746.pdfIn PDF document text
    • https://meruxanige.weebly.com/uploads/1/3/1/6/131636855/gamufegupiza.pdfIn PDF document text
    • https://kitetunevoneg.weebly.com/uploads/1/3/4/7/134703129/mitobuvekezewile.pdfIn PDF document text
    • https://remafubununabex.weebly.com/uploads/1/3/1/4/131437283/lapibugawibusuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475203/normal_6063fab700f2c.pdfIn PDF document text
    • https://gapibuxox.weebly.com/uploads/1/3/2/6/132695643/zuloniduruvaka_xetuvuleko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424025/normal_60176b80d1981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464739/normal_6066bdf76b44f.pdfIn PDF document text
    • https://jipukikibowema.weebly.com/uploads/1/3/4/6/134633032/6324860.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://davixezudi.pbworks.com/w/file/fetch/144661632/step_up_1_pelcula_completa_en_espaol_latino_descargar.pdfIn PDF document text
    • http://sutodoromar.pbworks.com/w/file/fetch/144506331/daxifeziretuwix.pdfIn PDF document text
    • http://zejokij.pbworks.com/f/risimasuveg.pdfIn PDF document text
    • http://pimepovume.pbworks.com/w/file/fetch/144481302/63357896034.pdfIn PDF document text
    • http://tebejeloxid.pbworks.com/w/file/fetch/144780783/best_citra_version_for_pokemon_ultra_sun.pdfIn PDF document text
    • http://sokulus.pbworks.com/f/64823682080.pdfIn PDF document text
    • http://rumusapage.pbworks.com/f/relion_blood_pressure_monitor_manual_hem-741creln3.pdfIn PDF document text
    • http://nomebazeregi.pbworks.com/w/file/fetch/144763782/wirer.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/dadosukilurudugiramijalax.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/f/wolf_online_2_hack_apk.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_off0001143a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143A 5192 bytes
SHA-256: 18410978c7e6026312c8e87807a03fc20d90eee3e7e0805337e4d41d95db8a2e
font_01_sfnt_off000125c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C9 12720 bytes
SHA-256: a84a86d17317be3e4ba70c9f181a64bed14f193feca7e460e5b79445984ed7e5

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