Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bf9f2c20bfd3c4…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 16:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bdb74de0edc78abfa52ff8eea27b49cc SHA-1: 4674dbb5eddb8b99e642bb00b7c55df5963541cb SHA-256: 38bf9f2c20bfd3c4749f6a3b15a79aa1db2343a5fce6a63c0e897b341db86a30
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pistant.ru/uplcv?utm_term=no+keyboard+on+android PDF link annotation
    • https://marjoyunlar.com/calisma2/files/uploads/rugaxixiviviji.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/keloxerubuzuvokigus.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/muvasamugilumukazusaj.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/428b42ddfc27fb216f310c8c1a4613a8/mowevimagazupinipaxowom.pdfIn PDF document text
    • http://salt17.com/userfiles/files/8799333077.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/katili.pdfIn PDF document text
    • http://kotolantopeni.cz/file/62584976461.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/kefes.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/19135624230.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/33135486601.pdfIn PDF document text
    • https://datajournonepal.org/files/xujelu.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/96560413858.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/66131020932.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/82338315085.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/dujibe.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/kebufawotepaxinilop.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/zelazo.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210909_90DDBBDDFA82E6D1.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f4b45e16d---lukalona.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/70696521825.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/fejumonifojun.pdfIn PDF document text
    • http://agrion.org/upload/fichier/jugusenuginokebinavezusag.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/97970524620.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/gafujorafoxexerom.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/jiwaji.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/jufamosobobovipekozexo.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_off0000cf24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 10252 bytes
SHA-256: c9cda55b6d0b1f5205091e40a377558b4cf8fbec36b62d0844772156fdd336c3
font_02_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 17336 bytes
SHA-256: a959f6e3b66e1478bd0f5caf5ca8e8e6b948daf6422835dbe528b93d3c6479f4