Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f1373844471a15…

MALICIOUS

PDF

41.6 KB Created: 2021-03-22 10:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5ec25eeafe6e8167872d1dc4d9fa3bff SHA-1: 6d834cb8bd808e4db3748bb92830a30db15cec13 SHA-256: 77f1373844471a1557b0ffa0e56ba32e05234b63230f4ad3e68dcd6f92a2bb39
204 Risk Score

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 0.8113

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 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.
  • 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 41 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://gimoguvi.ru/aws?utm_term=the+best+ice+cream+makers+ever PDF link annotation
    • https://lowunidedalovel.weebly.com/uploads/1/3/1/3/131380213/4552028.pdfIn PDF document text
    • https://vexixizeled.weebly.com/uploads/1/3/1/3/131384380/xivujaserefija-lugobire.pdfIn PDF document text
    • https://xolavubapipivuk.weebly.com/uploads/1/3/5/3/135302485/radusivipidir_sikova_satorativukakug_kidopovavopasa.pdfIn PDF document text
    • https://sefelitajirowa.weebly.com/uploads/1/3/0/9/130969992/3429901.pdfIn PDF document text
    • http://zutelotojenexop.getenjoyment.net/wages_and_overtime_worksheet.pdfIn PDF document text
    • http://rivilidopu.medianewsonline.com/tederexipuvanufelez.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/bible_in_greek_and_english.pdfIn PDF document text
    • http://wexoxunesixu.iblogger.org/centum_vp_training.pdfIn PDF document text
    • https://vomuzubedabop.weebly.com/uploads/1/3/0/9/130969103/91363458f857.pdfIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_a6531d7c946147b39593be307a9aff0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f4ad00-1d48-4038-a980-e160704bb956/experience_human_development_rrmcg.pdfIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_1d99a4731bec4103a59a20175409fe9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d62b41-48b8-4ede-89b2-7f3c50f2f428/big_fish_audio_vintage_guitar_loops.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2538d53e-8d5f-453e-8877-cdc5ba62bf87/how_to_teach_preschoolers_about_winter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f884b33a-3289-4bc4-a3b2-af8fba8ca228/kesemijobowowozujuliwizi.pdfIn PDF document text
    • http://fosarasopu.rf.gd/nowotet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c98c537-c041-412d-8448-0fcd1dc45e29/what_to_do_when_your_roku_remote_isnt_working.pdfIn PDF document text