Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20e6b623431e423…

MALICIOUS

PDF

69.3 KB Created: 2021-09-20 21:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 618bb57612d7db6db8f05b9e3a3b91c6 SHA-1: f6b9d8b6dbe1e42ae3f93148e51fe6bcedc4100d SHA-256: f20e6b623431e42381a6b2b117dcbae92e1d3c9a07719198694e988b2a72bc61
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains a large number of embedded links pointing to various domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm characteristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://smidgel.ru/uplcv?utm_term=android+repair+pro+apk PDF link annotation
    • http://chistogood.ru/admin/ckfinder/userfiles/files/mimumupurifaxora.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/karofasovire.pdfIn PDF document text
    • http://guchen.ru/d/files/nedoja.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/82052764112.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/pamedofesuwotivakeje.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/1964129111.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/wogalakibuzegami.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614510755d49e---54878679425.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/75262931527.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/19896960893.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/difot.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/28107502416.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/zatigoditerenukipoza.pdfIn PDF document text
    • http://etre-belle.su/images/file/gadenisugojupopotoluxured.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/76502374260.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/betatuvuxira.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/sutixatovosaveju.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/tekemudabukavo.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_off0000ad03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD03 17208 bytes
SHA-256: e7949468b06bd1bc6dc224b7c974205a69c7500c9de1f510b91c62d0cebf854f
font_01_sfnt_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 10148 bytes
SHA-256: 5ac8dcf78e805f0483f5c58aedebf06277a6d06336e525ab6a842d16b569b249

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