Malicious PDF — malware analysis report

Static analysis result for SHA-256 78eabf2becfd7387…

MALICIOUS

PDF

73.1 KB Created: 2021-09-24 13:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8173c9ad7611cd708765c943d6a27bc SHA-1: b123c585d9a63f1997fc57e58e872e0d3b8aead0 SHA-256: 78eabf2becfd7387121df18bf9e547384e5b68b5b09e77a0dce268e66c697268
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment, likely leading to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=run+android+studio+app+on+phone PDF link annotation
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161336ac990e95---tonepin.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/binibadexuxipemuwi.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/93632948032.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/pofavu.pdfIn PDF document text
    • http://pk.mo/userfiles/file/rugozawulidofifolikadejo.pdfIn PDF document text
    • http://packamate.com/userfiles/35022703757.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/57045081840.pdfIn PDF document text
    • http://neteyes.eu/editor_up/fevudirodizadorutuwov.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/15829795305.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210911_73EAD1BED05FABCA.pdfIn PDF document text
    • http://topstec.com/d/files/21695568537.pdfIn PDF document text
    • https://esvigo.com/upload/files/21385845136.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/rufozoxotobumubodad.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/94788410484.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/riwosavurabokijupilum.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/zofuvalebofufono.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/tamozagovufu.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/degejumotufenuwi.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/82407501216.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/subiwekuxorovamaz.pdfIn PDF document text
    • https://christianschoch.ch/userfiles/file/sovorokebaripiraribumedu.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/pefomefatovitekekaguvoris.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/gebeludurado.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_off0000b69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69E 10588 bytes
SHA-256: 97e8e12e721da677d6b152560499252b67e0fa6c1805ef600f0c8bf077688706
font_01_sfnt_off0000ceba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBA 18356 bytes
SHA-256: cd76e784305b27974151f9b1b8b2f75186da1127287237f5af0e73f97c3aa9a9
font_02_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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