Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9c480094741c2f…

MALICIOUS

PDF

70.7 KB Created: 2021-09-30 18:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: adccbbfa60fcaea43dd3c48901090a6c SHA-1: d5d3a8af97bf521cc86b6cd5eae37368f6b4558e SHA-256: 2f9c480094741c2ff7ccaf6804aee720da38226b0cf393ae24d2df7c01902a75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's used to redirect users to potentially malicious websites, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=boruto+198+full+episode PDF link annotation
    • https://sklep-pinokio.pl/web/uploads/files/banatisumufagozekobafufo.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/sumenafitifabuvojefugita.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614e17bbe72f3---tubax.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210917154841_p2a5li.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210916_180717.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/bajeje.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/dejevelazazunebi.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/43071234624.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/gesifizeliseb.pdfIn PDF document text
    • https://mediaskills.rs/files/79218648849.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/rijusuzunojedabexigivifam.pdfIn PDF document text
    • http://unsersohn.ch/images/file/bebopoduwifikef.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/sojuwiwowibopenelinet.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/wubov.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/26633406414.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/fodusotijurik.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/52613325690.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ginuzura.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/rusuta.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/56711899911.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210929_DEBAAF132DBCE89E.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/67907406874.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/saxisososekewopit.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/wunuwamope.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/98490160349.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_off0000b23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA52 10804 bytes
SHA-256: 4df700f57bb02e49909e357e87563c9dfe788030a49b9ef351264ec128fd7427
font_02_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 15868 bytes
SHA-256: 2c1433b1c1ed77e6080e6c0c0c11d67ff6f45a2b3fb95f20d718ebc21f441e36

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