Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6cadf92e756c7e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-20 17:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74ad260058a878126922bb21b0c14a1b SHA-1: a97663600f610835be591f525032be41b7100541 SHA-256: 9a6cadf92e756c7e1ae7755a1bc15068f3919915aa951adeb54d9fc34b6d6403
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to link farms and disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via the linked content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=athiran+mp3+song+download PDF link annotation
    • https://www.channeloflove.com/ckfinder/userfiles/files/gojunugefejafavapivow.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/bunufavowapunidow.pdfIn PDF document text
    • http://unseretochter.com/images/file/28885102759.pdfIn PDF document text
    • http://invest.pl/userfiles/file/3906913367.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/mefewejubone.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210907_6A668E32606202AE.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/51197577349.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/89907856803.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/varanodawow.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/78922144523.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/paleweruwisizutigukabufis.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/15958641065.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/lipivetovofofesugezi.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210902_224542.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/82298603826.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7dbb3124f---mugex.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/solodinesejonalojom.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/35107040825.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/wabej.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/11709038003.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/xudeduxifomuro.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/50905726181.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/81985361378.pdfIn PDF document text
    • http://isvpro.com/custom/files/57932853165.pdfIn PDF document text
    • https://bu8m3tas68s-b1.com/contents/files/temitekenoto.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_off0000b7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B8 15632 bytes
SHA-256: 9f505935daa6a74db944e0f7dedb9927a25150285261094dbb19795815da8725
font_01_sfnt_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 10948 bytes
SHA-256: a1a8d1ebfe4a354317e004d86fb4565066e908b2d0769dd56c30753c22125e3c

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