Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc72860d9e264da9…

MALICIOUS

PDF

76.7 KB Created: 2021-03-08 10:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4a1e28d24004984d328199e1ee90a3bf SHA-1: a54482005f1ac824cd537146d74d83b114f3ed9a SHA-256: fc72860d9e264da96d30b4e3d28e7c38af678a2a27024a686ae35907ad5af58a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The presence of ClamAV detection and an ML classifier flagging the PDF as malicious further supports this assessment. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=vowel+diphthong+worksheets PDF link annotation
    • http://kevarusakoko.mypressonline.com/what_are_your_biggest_weaknesses_best_answer.pdfIn PDF document text
    • http://smm-target.ru/clube_de_dana_gta_san_andreas3xpdz.pdfIn PDF document text
    • http://cozyplacefor.rest/usher_old_songs_listyvkx0.pdfIn PDF document text
    • http://lightly.store/chickie_and_pete_s_nutrition_guidejo9et.pdfIn PDF document text
    • http://capridigi.com/wahl_dog_clipper_blades_australiayr2po.pdfIn PDF document text
    • http://frankiearvelo.com/invoice_receipt_template7oe9k.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/zabidaw.pdfIn PDF document text
    • http://geosen.net/super_usb_cassette_capture_software_driver_downloadqlc95.pdfIn PDF document text
    • http://figuxovutofid.mygamesonline.org/35530001490.pdfIn PDF document text
    • http://ulekschool.online/cmos_current_amplifiersk6oot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zetituri/guwujunakokositisu.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/pumejamipomakodetuxoguv.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/dunezesiwixatopusebiduw.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/chemistry_textbook_high_school_online.pdfIn PDF document text
    • http://memamawu.onlinewebshop.net/tipomemexometurikuke.pdfIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_93cb1be7899e4909ae58e49bc4db6165.pdf?index=trueIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_a5b2c06521064b99ba5ee119e5e4f9dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/top_app_sites.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_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 5132 bytes
SHA-256: 618f99dc733f6d4a0b385b4192367478635239f35455ee9793dc1a253977ae50
font_01_sfnt_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 11220 bytes
SHA-256: 77baa3df89dc1e79e92807df6dcc74510298aff66d7bc6bfdea865f29f4a9daf

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