Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69a60b2a7c550a0…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 04:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d9cb4c5a66d1b8ecabf43cac5a9573c SHA-1: f7332385a84f205da7c5c9c095d121698a99fca9 SHA-256: b69a60b2a7c550a059132a9a7814124196e28794f636722a349d94eb8bdccc7b
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a download link with UTM parameters, suggesting a phishing or malware distribution lure. The PDF structure and the presence of external links point towards a common attack pattern for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://crewmak.ru/uplcv?utm_term=download+windows+chromebook PDF link annotation
    • http://baheth24aqari.com/ckfinder/userfiles/files/fogefivabipugu.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/soxugigirum.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/55263777448.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/36213945311.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/6367317891.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210902131528.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109111718412677.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/32977213088.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/571727623.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/zobijomaliwixojinirejiri.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/95522083153.pdfIn PDF document text
    • https://seikai.jp/free_images/files/43398270218.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/75475950147.pdfIn PDF document text
    • http://actinq.nl/upload/file/zutewejisokerewawej.pdfIn PDF document text
    • http://schokofontaenen.de/idata/gidewima.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139197fe6d66---gitivabekijixanozidekab.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/sijotuze.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/70754181751.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/dugowomusafurubizenum.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/24139856268.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/89042454263.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa2b3e139---mozapekotofili.pdfIn PDF document text
    • http://elskenecologie.nl/files/josefe.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210902023730_amiuh8.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/loribupalogojorofojad.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/vamatesumikupurumenuku.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/popidawarobas.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_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 10856 bytes
SHA-256: 7e77447bfb368572759272693639010ec4ed1fb24f7fa238db796e626f4288f2
font_01_sfnt_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 16936 bytes
SHA-256: ca3e580835a3e79825e48eaf3dd81bad659db179f0a708374122bc0e6206ac10
font_02_sfnt_off00012084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1