Malicious PDF — malware analysis report

Static analysis result for SHA-256 508156ae231bc4d7…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 02:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5dc2384dca39a2f6ab9791686e9c0bd SHA-1: c5987d19f3389b5bdfd352922abb2ce54698b65c SHA-256: 508156ae231bc4d76a0c88d19a0b19ebf4ab663ccdb4aadf276c2eb918e8816f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://coretry.ru/uplcv?utm_term=ios+11+emoji+apk PDF link annotation
    • https://ijaetis.org/ckfinder/userfiles/files/tanafojurimereg.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/73696588229.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/90724486035.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161417d4c9cac7---pedegib.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/soxuf.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/7904178857.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/2719346703.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/pezusutevugubetudodew.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/58283828851.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/dinidupubonoxadakaduj.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/sumibejo.pdfIn PDF document text
    • http://thevale.us/userimages/wimufuru.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/subikew.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210902111834.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/jetokuzasirewi.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/bepotokavevajowowozu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/0efe6620ffa912118cfbcbd4ca0ad8d8/25704930797.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/xujewuna.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/gozavunexaju.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/28369536625.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091122510215.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/jibotugixudataxu.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/16564740662.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/munomajepiwiluf.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_off0000c881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC881 10288 bytes
SHA-256: e4c85cb741c73b9f86c2e2edbef716eda14c882a9c391e096eed30a62e417983
font_01_sfnt_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 16972 bytes
SHA-256: 4b3cf5c6393fa15c1ff06a71b05e75e36e56bfb3f6fce81583f7e583477c7794

Open this report in the interactive analyzer, or submit your own file for analysis.