Malicious PDF — malware analysis report

Static analysis result for SHA-256 c821c3a652d53a6f…

MALICIOUS

PDF

40.1 KB Created: 2021-03-20 07:33:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: da09d7b49f789ff04a16f6db6feddf6c SHA-1: abd6cb5b3ba2e748a83608d16a31c74af673f057 SHA-256: c821c3a652d53a6f0dbc945323cc76c89cfce844fbf5c6a45f568f53068ee8dc
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8424

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 40 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://dafemum.ru/award?keyword=each+other+and+one+another+exercises+pdf PDF link annotation
    • http://sizuxofutitarax.mypressonline.com/plantronics_m180_universal_noise_cancelling_wireless_bluetooth_headset_-_grey.pdfIn PDF document text
    • http://gasurorir.sportsontheweb.net/nazazuwinerilure.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/how_to_find_sim_current_location.pdfIn PDF document text
    • http://piwegowukatugib.22web.org/what_are_some_job_related_accomplishments.pdfIn PDF document text
    • http://xulazawelinuze.scienceontheweb.net/how_to_connect_wireless_mouse_with_usb_receiver.pdfIn PDF document text
    • http://wijutomotagam.mypressonline.com/9223767775.pdfIn PDF document text
    • http://xezobofelupazat.22web.org/loferagus.pdIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_ce424a65525842f5946376aa7ca0c116.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/at_t_company_profile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede43fc7-8a44-4ec8-9253-24e6ce40a289/how_to_stop_lg_direct_drive_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/job_references_list_template_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cad4c9a-956f-46ca-aa3f-ee8e1ccd553d/sezewi.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_ea433390c3734812842d8112ab6603d9.pdf?index=trueIn PDF document text
    • http://temomuduzuba.epizy.com/98663340831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca8babb0-9872-4484-95f5-8e93f1c8b62d/mutepedajasudizupuwakop.pdfIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_db6b78d596db4dbe8390d0dfa6f832a9.pdf?index=trueIn PDF document text
    • http://wupewujivijulo.epizy.com/calendario_maggio_2018_da_stampare.pdfIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_2e5f38c3d06b4827ab2d535ef2cbf865.pdf?index=trueIn PDF document text

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