Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8fc85488d4a78b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 00:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 92951d0fe6e951607b9844c15909634e SHA-1: 78961bf67b014236e3095c7fe6b0785c300093e5 SHA-256: 1c8fc85488d4a78bec13d9d68e44d52eae5295bcca4fa9b57b8d540a4539047b
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 maliciousness. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://oniceh.ru/uplcv?utm_term=david+dobrik+app+android PDF link annotation
    • https://gruntbudowa.pl/files/file/tisufuzolojaridikovujepik.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/letapejalavejidofidedoja.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/gubojaterewomewodije.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/62144189246.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/3328853150.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/widigusaposebitixuletefem.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/33813980061.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/43781966581.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/nadezabosisozoxudo.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/87136831432.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/nezuludof.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/561902676.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/37574756621.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/kopawikijawusuvifumi.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/90337642649.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/89458426935.pdfIn PDF document text
    • http://benly-carson.com/product/files/sisir.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/67046482200.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/wukisireduwan.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fac4d3267---kavebu.pdfIn PDF document text
    • http://reylab.com/userfiles/file/65067149528.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/xuzetatibekutat.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_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 18056 bytes
SHA-256: d7a394e9565c51b3f38e7c4d0bf47dab21a675c7ae2518e12af17b83b8e5945e
font_02_sfnt_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 10240 bytes
SHA-256: a3898b470bce63c99993f9a4e8b37020ea5023791c7d215f37687ffdaf7d24d6

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