Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ce6a66abf6c9f6…

MALICIOUS

PDF

86.3 KB Created: 2021-04-05 19:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d2d06ef3c085c6a2d60181b983291b6e SHA-1: 632a374d4f4a0e51bb83e4a4ad55a4b69edeb7dc SHA-256: 75ce6a66abf6c9f6c8451c786d8beba2c623646f8dfda3364ff7ee34e3e52917
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are generated SEO-style links, indicating a link farm or phishing attempt. The primary malicious URL identified is https://nipisod.ru/award?keyword=ahmet+hamdi+tanp%25C4%25B1nar+be%25C5%259F+%25C5%259Fehir+pdf, which is likely used to redirect users to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/award?keyword=ahmet+hamdi+tanp%25C4%25B1nar+be%25C5%259F+%25C5%259Fehir+pdf PDF link annotation
    • http://vamolufu.getenjoyment.net/exercices_corrigs_sur_amplificateur_oprationnel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_2e0f5c9b44a34b7282483023631dcff7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/angular_5_formcontrol_get_value.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/75469134208.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_9582e7544a0e4160bcdac86e711fbfad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/888ea551-4b8b-4874-b343-15b195ce1871/calories_in_taco_bell_power_menu_bowl.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_7c2bace6621841e6ab2ae04cd7f2d202.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/penale/adultery_paulo_coelho_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/famasekoxixenasuko.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/autocad_cursor_command_box_missing.pdfIn PDF document text
    • http://sazebufaz.atwebpages.com/mesexoj.pdfIn PDF document text
    • http://karokifewugasuz.onlinewebshop.net/como_funciona_el_cerebro_libro.pdfIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_dd301fb3d4584c948c8a370e10cd6141.pdf?index=trueIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_b39808e0ea91464eaa314b497b98597e.pdf?index=trueIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_67c9648e80af4d12a4cc79b516f38c0b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lonozote/vapip.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/getal.pdfIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_c8a7ef06a9004d8499507ca1113c1a1a.pdf?index=trueIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_a9a5e8fdd8934b41b0cb3b1e59271e7a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d94e18-4345-4e34-aa13-ab169f1d6968/90447736399.pdfIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_5a5533b9b7fa4b1e828c731e5000303f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dalava/answered_meaning_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89bb8d30-e8c6-4e41-aa72-0422136ca893/55774439925.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11103 5480 bytes
SHA-256: e6052d26636fe1209ebfff460b485439b1b31d79c35d1e4976db4f3386f86dec
font_01_sfnt_off00012372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12372 12472 bytes
SHA-256: d8c532cc7f0f34a915884ab4eefb4dc7dfe7df6784aa81615b9fe938773bfd37

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