Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08e67244d74d3bb…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 16:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fa967bca939834a78dfa1bd9e706647 SHA-1: f4bfbfcaf95d7de4626903949a8468f703670e22 SHA-256: f08e67244d74d3bbdb7a658a0a79a821cf11df86ec4ea7b838adf596dd508819
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs that point to disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=old+testament+survey+notes+pdf PDF link annotation
    • https://carlojans.com/cms/file/bivavudodapajazipafiwakex.pdfIn PDF document text
    • http://mdtrend.hu/files/file/54122048137.pdfIn PDF document text
    • http://qwerty.pl/_data/file/tadakubukagonisur.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/bopipixo.pdfIn PDF document text
    • http://rayer.cn/d/files/lajexuxakodavegitegoru.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/nakisupilepijuzifo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-12/20210612113158816674.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160849426b3e95---31874957633.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/nilidaruwawib.pdfIn PDF document text
    • http://klefmarken.se/upload/file/livup.pdfIn PDF document text
    • https://noventa.cz/media/files/file/gifiwoxativipofosasiz.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/54535324513.pdfIn PDF document text
    • http://tyextractor.com/d/files/tigusekisitaxugujov.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/bepuvivobamubinipolad.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/tamarewuzofakikojatopeg.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/witexejimedunemufo.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0554d326e5---46386383265.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/21712013650.pdfIn PDF document text
    • https://sambelteri.com/contents/files/26745326773.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/rasobajusejiros.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/52441014173.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://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_off0000cfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 10872 bytes
SHA-256: 9f03ce7caa6b05430e4bcaea6cdb9872e1add60c788d723448d71d581d5f731f
font_02_sfnt_off00010124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 17684 bytes
SHA-256: 5834a20f6833a7a885793d3ccd803af7cb10439c8c5273d4e29247e29f11b013

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