Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1fc4539feee215…

MALICIOUS

PDF

122.8 KB Created: 2021-05-18 23:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 785d82b5b9160bad36821c22b5e854be SHA-1: 525d191d14568d7e429a17194bc5e15c327980eb SHA-256: 5e1fc4539feee21521e0c18d305bd41f1f7677cfb294e0b8d115161deb3f15dc
134 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. It uses an urgency-based lure. 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 0.9980

Heuristics 6

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/strik?utm_term=how+to+cheat+in+age+of+empires+2+multiplayer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425760/normal_6033d83f009eb.pdfIn PDF document text
    • http://sowugadawalu.iblogger.org/gireguku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_5fdc51a913a70.pdfIn PDF document text
    • http://bajelow.iblogger.org/ctfa_microbiology_guidelines_2013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488566/normal_60609e18457a0.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/fajujiju/waterpik_water_flosser_costco.ca.pdfIn PDF document text
    • http://butomepa.rf.gd/esio_trot_reading_level.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f216d31b-7d02-4965-bcbd-538b36eb45d2/ninja_blender_1000_directions.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/annual_report_2018_nestle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf14090-1257-4f04-956e-2fac1ce2dede/zidapunaxonopewagupojur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58dd2d24-4073-4aa7-88b9-13ae2b25bd40/82221911864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19440ddb-a79d-44b1-afb2-20087f01bf0f/skyrim_how_to_improve_smithing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1652578-4c1d-4a61-a623-eab5fc24b035/8436258575.pdfIn PDF document text
    • http://vunanan.epizy.com/66584517218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a12c61d4-35d9-4db4-98e7-5e2caee72393/what_skills_are_needed_for_software_engineering.pdfIn PDF document text
    • http://sopenexu.epizy.com/how_to_write_4_100_as_a_decimal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67cbdfd2-e365-4f93-81ce-4b430a9aec57/dogecoin_price_chart_volume.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/the_boy_in_striped_pajamas_full_movie_download_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/46131371949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/738dd4f6-219a-44d3-86bf-3fcdeba5c67a/a_feeling_for_the_organism_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c408bc7-37bf-486a-9ee0-b9d20749784c/10782584044.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/58156104727.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/how_do_you_dilate_by_a_scale_factor_of_1_3.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/bash_script_example_mac.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001804f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1804F 5716 bytes
SHA-256: 2d34a5ea964874a772c96f33dd81295d86d546747123bc4e1a10cb7bb5dc8bdf
font_01_sfnt_off000193b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193B3 1984 bytes
SHA-256: 441688699f3490fe9aee30d3c3683dd5f0ec83df0846af31385f6a80b93698e6
font_02_sfnt_off00019d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D26 12008 bytes
SHA-256: ce79dc92bd38fb0c0a4e717f49c7bd9586ad03bc126ddb4ad731bb236b5e01f3
font_03_sfnt_off0001c658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C658 16212 bytes
SHA-256: f4e247bdee89b0f6125f90e517fae2cac9cd098809b1a4102bcf98cbfdcc894d