Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b216083b37aac0…

MALICIOUS

PDF

77.0 KB Created: 2021-06-05 17:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0468a573d9691801f40e34e9f9d62e69 SHA-1: c0d3a0bfda221c35da254bfba9a78bae83dd8ad5 SHA-256: e4b216083b37aac009dc87018baacdb017cabb0dc3f5b89393ac94d40c8d6211
172 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains a large number of external links, many of which are SEO-optimized PDFs, suggesting a link farm designed to distribute malicious content. The presence of invoice and download lure heuristics further supports the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=receipt+template+free++excel
    • https://cdn-cms.f-static.net/uploads/4465545/normal_6062f90d5fa20.pdf
    • https://ragesetenavuxom.weebly.com/uploads/1/3/1/6/131606186/rukaxobarati.pdf
    • https://cdn-cms.f-static.net/uploads/4478415/normal_60278e53b9430.pdf
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/8377570.pdf
    • https://jakuxibakamu.weebly.com/uploads/1/3/1/4/131407414/sotarepezan.pdf
    • https://lanulizuxuja.weebly.com/uploads/1/3/4/6/134658029/0c9be24e545.pdf
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/a004f3de11c.pdf
    • https://cdn-cms.f-static.net/uploads/4483624/normal_5fdc078c9e8f6.pdf
    • https://cdn-cms.f-static.net/uploads/4368978/normal_602b012849f87.pdf
    • https://ladifibefumuxuw.weebly.com/uploads/1/3/4/3/134353250/6720179.pdf
    • https://fajasorefasox.weebly.com/uploads/1/3/4/3/134348900/fofox.pdf
    • https://cdn-cms.f-static.net/uploads/4427809/normal_6019d6207ef96.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mulasamesi.pbworks.com/f/neoclassicism_in_literature.pdf
    • https://uploads.strikinglycdn.com/files/a002095c-8253-4f4a-ac1b-2817a1e32137/jizoneworagenifemu.pdf
    • https://uploads.strikinglycdn.com/files/73c0f309-d1df-4288-8f79-bbfb7861de20/carbs_in_taco_bell_taco_without_shell.pdf
    • http://gemometis.pbworks.com/w/file/fetch/144513468/icloud_unlock_software_free_download_for_pc_2018.pdf
    • https://uploads.strikinglycdn.com/files/c32447ef-46bf-456b-96b1-4fa522eaa88f/dimuxiw.pdf
    • https://uploads.strikinglycdn.com/files/daaed32c-38cb-4cf4-860e-ec97dd79f94f/connect_directv_hr24_to_internet_without_connection_kit.pdf
    • https://uploads.strikinglycdn.com/files/6b89e10b-e992-4674-8578-870c1340ff85/16608967599.pdf
    • https://uploads.strikinglycdn.com/files/448fa1bb-a4aa-4c66-9337-0f53ba09c4ab/marupigepawugupomukawem.pdf
    • http://pusurupufem.pbworks.com/w/file/fetch/144654807/21_day_meal_plan_myadventuretofit_free.pdf
    • https://uploads.strikinglycdn.com/files/c55b7c5c-3f78-49bd-b580-9e14291d5bac/best_survival_horror_games_nintendo_switch.pdf
    • 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_off0000f013.bin
0df4d919dcb4d94eb514bdfd5939170b8e630b4fd2f2fcb4bd178538662446be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 5060 bytes
font_01_sfnt_off00010142.bin
9b50760249cf861d283266eaa5ed6db46450de9aa1bc90f86654c33a473ab7fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 10988 bytes

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