Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce783e9ff7501fc…

MALICIOUS

PDF

81.5 KB Created: 2021-05-28 22:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b9576f829ec0106ea9a8d11bdf70cac9 SHA-1: d1870e74863f76e5927c36f5685a21168421ab76 SHA-256: 8ce783e9ff7501fc9b24ebb5b2dc2e9b84909851f0492af5a3c21bbe88dfddbd
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8088

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
  • 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.
  • 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://zajinet.ru/strik?utm_term=golf+clash+tommy+updated+text+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491665/normal_6069e47aaab96.pdfIn PDF document text
    • https://guvavibigedufos.weebly.com/uploads/1/3/4/8/134855984/5662187.pdfIn PDF document text
    • https://xisegebimir.weebly.com/uploads/1/3/4/3/134340076/cbb2b4383070f39.pdfIn PDF document text
    • https://falesejus.weebly.com/uploads/1/3/1/4/131483218/nufejikube.pdfIn PDF document text
    • https://robiwadanojiso.weebly.com/uploads/1/3/4/6/134644007/pupisarisafe.pdfIn PDF document text
    • https://widutelakil.weebly.com/uploads/1/3/4/3/134378670/5811267.pdfIn PDF document text
    • https://xifutasuwisesa.weebly.com/uploads/1/3/2/3/132302919/7674249.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451375/normal_5fcdaf2c17a3c.pdfIn PDF document text
    • https://nozirurabi.weebly.com/uploads/1/3/0/7/130738896/magixudebiveroj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/671f33f3-ceb0-4a08-8390-b139a289d3b7/asi_hablo_zaratustra_strauss_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecfc99a2-5c11-4f9b-8334-85509c1e9224/dream_yuga_110_on_road_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/177a2daf-a97b-4911-be2b-cc5f8427213a/tafowaximogixidedixuwariv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18d7725c-95fa-48a4-a3e3-a0633abc574c/how_to_charge_my_passport_wireless_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3983aeeb-14de-4d0d-a2d0-7ee5cfa9376e/descriptive_writing_examples_for_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56138ff0-cedf-4d1c-955b-b2d2ca524d02/52454356584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d60658a9-d77c-47ae-a7bd-4c8080fb2451/free_drawing_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39428a1a-03f3-4b24-9f1a-0b578c107270/understanding_vocab_for_ielts_writing_and_speaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4704e18-8e3d-4e42-a824-3a028481339f/how_to_test_outlet_with_cen_tech_multimeter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd0a311e-7975-4382-8ccc-1e186fc66be9/62387249223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/034bfa0d-1486-4163-9064-accbc2ae58a0/xilevarafuv.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CD 5676 bytes
SHA-256: 21e4d4e80c7c793d3ed31e0761879c8b4fe691f7d04a10cc2e6e670be6f35b3c

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