Malicious PDF — malware analysis report

Static analysis result for SHA-256 3474f29de97e44e3…

MALICIOUS

PDF

72.2 KB Created: 2021-09-22 10:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cba485e7dafa7ee6e32f782389cd7a38 SHA-1: 0ee9cec72a3a331f914400768897781d2138c816 SHA-256: 3474f29de97e44e3ef81f41d34e599758f94a15391b2bd60b48cff62b113ecab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many on disposable hosting and using UTM parameters, strongly suggests a phishing or link-farming operation. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=how+to+draw+anime+style PDF link annotation
    • http://ilovechardonnayhills.com/userimages/tabokig.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/mokawew.pdfIn PDF document text
    • http://altinay-law.com/images/file/27265847047.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/94068686147.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/dadalezikuluzi.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/mobibetonokakuladit.pdfIn PDF document text
    • http://vhshf.de/File/petuxadazi.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/44157796185.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/27358447415.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/serarilugudin.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/lubebolubiwuvuvokuvabopaj.pdfIn PDF document text
    • http://citty.org/images/uploads/file/kipezipaxowarupupag.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/42618617328.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/81673290347.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/9418201095.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/lawaderojafofupipiwipere.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/37517397231.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/fezuwegaboza.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/sumolovivasufe.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/bewelidof.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/rugabawiv.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161392b22e87b4---13823713132.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/92642251851.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/13387876639.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_off0000b7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF5 10600 bytes
SHA-256: 2157655c2feb10a1f4ebfd0aa957e9fdea13b80470531bb38eafd99c97d43473
font_02_sfnt_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 16936 bytes
SHA-256: 5757be371b0676208a61b427985e4cb6894b2273d2b8a01d834c947cf81343dc

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