Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16c5a158eb9e469…

MALICIOUS

PDF

70.1 KB Created: 2021-09-20 05:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e802ea18beee55b9c7f2285278e0c2e7 SHA-1: cf6e3c2d631e10d0a8c708cabdcbb0793aa75946 SHA-256: b16c5a158eb9e469b017228cbcc5d1bed25e8a63c93dc8c092382db6114ca45b
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. It contains numerous embedded URLs pointing to external websites, suggesting it functions as a link farm or phishing lure. The presence of these links and the overall structure strongly suggest an attempt to redirect users to malicious content, likely as part of a phishing campaign or to download further malware.

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://crysiq.ru/uplcv?utm_term=opera+mobile+store+apk PDF link annotation
    • http://buyyoutubelikes.com/ci/userfiles/files/vutadevuxujuvoxilokewor.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/51250828284.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/20619179090.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/jojetuzizaxelejujujizutej.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/4295174725.pdfIn PDF document text
    • http://cortabellanews.com/userimages/bedefovezowibu.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109141322556718.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/65442844908.pdfIn PDF document text
    • http://hadt.vn/upload/files/70059643294.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/selujinowuvixibagoj.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/fecdc29f61cad65fdf3f6360c000f0bd/kerip.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/82985629717.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/dinijizi.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133eac6c8ac8---60526063193.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/fugedirexetu.pdfIn PDF document text
    • https://cargotavio.ru/files/file/gudusuvejovoxu.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/pinudovabiwaka.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/57002386380.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091016050641.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/26113930822.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xibutanuwakogobatexini.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_off0000b0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC906 16468 bytes
SHA-256: 73fef63036d6e9eaedbd563bb03a7a6ae8abffa141d78000f19ababf4e361b02
font_02_sfnt_off0000f36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 10564 bytes
SHA-256: 9f9b1dadb8abcbf51b90a1b6a39bf55ff752ea8dd091afd5df68731956b43733

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