Malicious PDF — malware analysis report

Static analysis result for SHA-256 af02f98fb352acdb…

MALICIOUS

PDF

78.9 KB Created: 2021-04-03 19:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cbb56669ff02306dbd196725ab03fdbc SHA-1: 54d1c74dac0aebe47fff30a54a9d530d207e8076 SHA-256: af02f98fb352acdbbf6f6b76aaa8a44bbc4dd670b40c431a51aec8eab2290939
186 Risk Score

Malware Insights

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

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 0.9994

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.
  • 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
  • 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://leonvi.ru/strik?utm_term=pretty+little+liars+season+4+episode+24+cast PDF link annotation
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/2220220.pdfIn PDF document text
    • https://kixivoveluvib.weebly.com/uploads/1/3/0/7/130775150/8365433.pdfIn PDF document text
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/tetavujunuso_kavudu_zisom.pdfIn PDF document text
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/9693942.pdfIn PDF document text
    • https://mafoguwof.weebly.com/uploads/1/3/1/4/131438304/weliwatijemax.pdfIn PDF document text
    • https://kakifiku.weebly.com/uploads/1/3/5/3/135347754/zafowepuwug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407562/normal_5fe8433fe9dd6.pdfIn PDF document text
    • https://figapizezedop.weebly.com/uploads/1/3/4/3/134364787/mujisi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445731/normal_5fecaee00d3b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_6054ad237d3ea.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/7f180a7f-9955-4bfb-9dc5-ed748aac0559/batman_the_dark_knight_returns_comic_book_value.pdfIn PDF document text
    • http://bosulug.epizy.com/school_attendance_sheet_template_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460055b2-334f-484f-bed8-123719d5f312/wixenaza.pdfIn PDF document text
    • http://wivifizurata.epizy.com/safarologonuvodataben.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6bff67e-0eb4-4d7d-9995-7b8eff373c8b/67001702394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/547fb3b4-7c87-407e-aabe-6ac89ab969c6/cuanto_litros_tiene_un_metro_cubico.pdfIn PDF document text
    • http://pevuzimoba.rf.gd/cuales_son_los_alimentos_que_puede_comer_un_diabetico.pdfIn PDF document text
    • http://waratukujuzugij.epizy.com/best_self_tanner_for_beginners_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7763b642-eea3-4eaf-9e77-a8101af8af59/what_does_it_mean_when_service_airbag_light_comes_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e52c8b-5c99-47dc-957a-b25ae101bf07/what_is_the_role_of_an_assistant_operations_manager.pdfIn PDF document text
    • http://wovikoverule.epizy.com/the_writer_presence_9th_edition_table_of_contents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d0c774d-01e2-4237-a2dc-f76827a1b50a/larotamenimumixaxodila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ff4825-2d2d-41df-bc15-6fe89d1cc4d8/80603161685.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_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 5392 bytes
SHA-256: 8db9c9cc50cde9007795c7924834d2a086e73f2b4b07a40aa82ab25102fc0550
font_01_sfnt_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 10588 bytes
SHA-256: 24619c5b98556f6c2668d881c595e634bb0f5202f693e72eb7309ed36733363e