Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f45e07c001a577c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 08:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 653293202764e514f139de1089cd1acf SHA-1: a33c17a5e4147c0137fccc2ea6f4e1cba3c9d788 SHA-256: 8f45e07c001a577cf9b9c354a7ac78e311ed2f3854d2fd730974fb39a9a73583
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which appear to be part of a link farm designed to redirect users to potentially harmful content. The PDF's structure and the presence of external URIs suggest it is used as a lure to direct users to malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://medvor.ru/uplcv?utm_term=how+to+make+disease+disappear+pdf PDF link annotation
    • http://zbirozskepodzamci.cz/userfiles/22458478856.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/jewabe.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/pavidulafoligosemakol.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/41995f2d8519284a55b76467ead9c6c8/janawenulegegerip.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/botaxir.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/ponozosikubun.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614316a7e38c8---daxululidenimozikifakuze.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/89966352317.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/7632455183.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/lufis.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/rekebivazuzo.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/pudawoz.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/nefifamagipabe.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/34149897533.pdfIn PDF document text
    • https://medtek.vn/storage/file/lukojaxaxos.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/7726444277.pdfIn PDF document text
    • https://viceda.com/userfiles/file/65130582786.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/fovowunibapodulemuxi.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/waxotixezagobizodu.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/92029018344.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/96350727968.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/kakimasekumojolopos.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/4576604210.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/lopofizilan.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/29266659636.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_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 10680 bytes
SHA-256: 9e322578963430789114e52fd605320b0a81c6103a784aad4d7c275a91223da8
font_02_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 17692 bytes
SHA-256: efcc52b345a71b3c11b99d8bfb0017f2cbc2aab7368920ac63502d2caa96ef79