Malicious PDF — malware analysis report

Static analysis result for SHA-256 a569f15355fe1f90…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 13:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2bfea5d7f0e10fc32f7038a176139bf SHA-1: 38a3c3f2c52779e4353293c14332072bf6ae7e42 SHA-256: a569f15355fe1f90b580f186849632494800e2daa053c2d2f30af6befab0a133
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to disposable hosting or redirectors, indicating a phishing or malware distribution attempt. The PDF structure and the presence of numerous external URIs suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=the+rabbits+shaun+tan+pdf PDF link annotation
    • http://sambometal.com/dataroom/file/vajibikekalejatimipeji.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/luzijapadewanizusa.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/25537200468.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/kaxagolekavi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0248c3e72---pupejulaj.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/nazudasejib.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/26559333715.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/6786519474.pdfIn PDF document text
    • http://vitrine-prof.com/files/19079900731.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/13419787527.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/85070773724.pdfIn PDF document text
    • http://www.puhito.hu/uploads/noveboburesupazarofe.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/fodureroveworozesaxi.pdfIn PDF document text
    • http://fabtur.ru/upload/files/vorizagepiwajes.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/roxoguderon.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/pawop.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/5929175396.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/zulakuzupiribado.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/81090056970.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/43256362805.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_off0000c3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BF 10632 bytes
SHA-256: 3c093b61f2aa1b6b217e526b52d96d291d47ea1c7a390f02bb491d680bad4618
font_01_sfnt_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 17448 bytes
SHA-256: 094b3a6a923d98bccbc5cb6a515468eed75ca5682445941159d1641ec53c6149

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