Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1f1d3b7a9f2e73…

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 16:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d21c4a960a4e6fc485c724465ba6dbaf SHA-1: 7a1f3f2234b9e539eeae239c90e562204c16f41f SHA-256: dc1f1d3b7a9f2e73e004ebfe8e735a751e26dc56a925162291e1c6772e0354d4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links on disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zxpgw.com/userfiles/file/84696623052.pdf In PDF document text
    • http://huiking.cn/uploads/file/091338514683.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/pesoxebob.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/35294757546.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/nexakijezuvubexiwu.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/wepalonozuxa.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/zekuxuguja.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/venifinoninaves.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/39937326477.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/62526781016.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/53171015027.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd0397bf9---60494820852.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/82989429514.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/58720745040.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/82153587930.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/38354670349.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/jupoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=last+android+version+for+galaxy+s3PDF 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_off0000e5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A9 18204 bytes
SHA-256: 7375f93a51cb05d9e6c5f748a2c88aa03b8981e1c754ab2553ac0af5b903ab4e
font_01_sfnt_off00011518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11518 10940 bytes
SHA-256: ff82a4aaba5785978a45b40213aeef5d4683554cc3a43393f9d41945e1a48299
font_02_sfnt_off00012e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.