Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af1f8675d02ecc1…

MALICIOUS

PDF

89.1 KB Created: 2021-06-11 06:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bc9770683ae089a711f63c75994669f3 SHA-1: ef7dbe1bff32d39efbfb2ebe0a7ed58c258478f1 SHA-256: 4af1f8675d02ecc148aef2ac991cda7e990baa8f4d9615be2abb379903b87ff8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified it as malicious, specifically a phishing or trojan variant. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 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://infrive.ru/pbw?utm_term=class+7+maths+assignment+on+integers PDF link annotation
    • https://dikugero.weebly.com/uploads/1/3/4/3/134356342/20dbc42d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385413/normal_600b6eefafc4a.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/muzutazupevokoloneb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421764/normal_6056e24a0c63f.pdfIn PDF document text
    • https://tonibefep.weebly.com/uploads/1/3/4/5/134585532/4867942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_605898a26c959.pdfIn PDF document text
    • https://ruritetij.weebly.com/uploads/1/3/4/7/134704214/xupefi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385004/normal_60085b5e205f2.pdfIn PDF document text
    • https://duboxudufafuboj.weebly.com/uploads/1/3/4/6/134676192/safewozoku_musix_vuwomexafalijup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c0956d1-458b-427b-b138-451df69bc526/56825739571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f61a5d61-a824-4a24-ae45-ce54b7987686/why_does_my_electric_hot_water_heater_keep_shutting_off.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/f/the_card_magic_of_nick_trost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c15a3b4-6c3c-44a3-af81-1cb436044e5b/26932044283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6911451e-4e8a-4a1c-b05f-e3813a614803/6660206683.pdfIn PDF document text
    • http://winubuton.pbworks.com/f/dotixogusomekilowoduveg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0c22d9-6347-434b-8163-cf707f7a5024/83508136816.pdfIn PDF document text
    • http://pewexojazo.pbworks.com/f/install_old_version_of_instagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e3fed2-293c-44d7-9328-cc7fcc8cda59/92259567938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1568730-aa41-4998-ae0b-5fcac21e91cb/fuxovipaval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e208f2db-1033-485f-a293-38586b6481e6/sosivawusugidokirudejuzuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be7b8fe-3fd5-4e50-846c-fc6e397aeba5/8698275560.pdfIn PDF document text
    • http://goxuluk.pbworks.com/w/file/fetch/144791715/bhajana_patalu_telugu_video_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb52e50-8dcf-4752-a4d7-ef6c659fe186/pozesebet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/329a4145-3ee3-491a-96b5-703e864a93db/82675265142.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 5084 bytes
SHA-256: 817383a2af341b029c9ec2f1ffe35bdde40ee910dc47654cfe66c8e26bb93a60
font_01_sfnt_off00011b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 11088 bytes
SHA-256: fc40be49cdb7eb7615541b94175b16ad0952d5e7fa016e696d968ca68807edd6
font_02_sfnt_off00014166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14166 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2

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