Malicious PDF — malware analysis report

Static analysis result for SHA-256 631d258d0cadf48e…

MALICIOUS

PDF

77.2 KB Created: 2021-09-13 17:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9d4cc1130ca85658576222d258424a84 SHA-1: 7d93b3ce2f1d60d28802e959fbe9a2d9f251c988 SHA-256: 631d258d0cadf48eef5a5107233913adc269382a345cbe9346667c09fb597c4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing malware. 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 designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://lse.hu/userfiles/file/72055264085.pdf In PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/30179409133.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/9556638644.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5eb5ea2d3---23364589142.pdfIn PDF document text
    • https://maymac.info/userfiles/file/xulipeliteropodi.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/zejilav.pdfIn PDF document text
    • http://pasted-radio.de/web/files/letopimotexule.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/12311218692.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a17d941a0f---pavozavuzaxebi.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/goluforovujebukawivu.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/58053994532.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/mepiti.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/41332888004.pdfIn PDF document text
    • http://jn-zhsc.com/upload/81513934129.pdfIn PDF document text
    • https://pratham.one/file/pufunikulal.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/vasovugutofumarebugun.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/42876635249.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/45976803563.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/bonatupiragojedav.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/xopumeg.pdfIn PDF document text
    • https://icbacademy.com/upload/files/mokibukanef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+snes+roms+for+androidPDF link annotation
    • 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_off0000c8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 17860 bytes
SHA-256: a46b33577d1ed71c447a88c6a1b32422242b213d785f7d363964bcd2d21eb7e6
font_02_sfnt_off00010f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 10504 bytes
SHA-256: e72d57225ae2a4da74712583e2cbddc9bf286152ee1ff97e47f3b30309f078b1

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