Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebbff2031ea1596…

MALICIOUS

PDF

75.5 KB Created: 2021-04-11 20:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b733ebf3aac7c5d853c2325a23d14b2f SHA-1: 154a6dae700c2fa591f3cb86462b61969bbec199 SHA-256: 3ebbff2031ea15962bdcda1d1b3dc86d69d18a2daab5be1ddfe0264ad2d76262
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 0.9997

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 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://maypoin.ru/strik?utm_term=gopro+swot+analysis+2019 PDF link annotation
    • http://memowelubi.mygamesonline.org/hillsborough_county_public_schools_fall_2020.pdfIn PDF document text
    • http://motogulexeb.iblogger.org/the_hacker_playbook.pdfIn PDF document text
    • http://govugododuwo.iblogger.org/cccam_plugin_free.pdfIn PDF document text
    • https://miluxeto.weebly.com/uploads/1/3/5/3/135326788/makixefumir.pdfIn PDF document text
    • https://nibobesexetew.weebly.com/uploads/1/3/4/2/134266191/noduz.pdfIn PDF document text
    • https://xukopalobupekon.weebly.com/uploads/1/3/4/7/134730613/6589877.pdfIn PDF document text
    • https://suxapenogabako.weebly.com/uploads/1/3/4/6/134602080/dimugagipe-buxufikimujejis-milemoj.pdfIn PDF document text
    • http://gonifarej.mywebcommunity.org/romeo_juliet_telugu_movie_songs_download.pdfIn PDF document text
    • https://devomideribura.weebly.com/uploads/1/3/4/4/134401990/5fd02260.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xutirekivob.rf.gd/futuwenozejizuxipeloru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f011d24f-42cc-4055-9f41-c1b78f10004e/sportline_electronic_pedometer_350_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3589fa5f-6750-4928-be16-93d482ff3282/m_audio_keystation_49_midi_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b8cda8d-03c9-458f-8256-c0af032b7069/39438263050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a99dfa-f575-43bb-99cc-d2fd021b36ae/15558323625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df87747b-fb2d-47c5-bd78-ba059c7361ca/order_of_the_stick_on_the_origin_of_pcs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/874fcb0f-d7c3-4b00-b57b-bd996b623b52/how_to_run_a_market_stall.pdfIn PDF document text
    • http://witagox.epizy.com/animal_farm_novel_study.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29e22262-ba62-447f-ac98-8efd373d104b/xisamux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41209542-30e0-42a2-aff3-e0d5910c444a/50_shades_of_grey_playlist_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a85d7492-151d-488b-b1d7-4b09bcf9ef7f/20521795303.pdfIn PDF document text
    • http://gegokuberil.rf.gd/coronary_artery_bypass_grafting_surgery.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_off0000eae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 5520 bytes
SHA-256: 8ad9248d38d4a380584690e9f2137e827e91c94651e4a8499c6254d9c3b1934f
font_01_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 10256 bytes
SHA-256: 01982219f59c6ecb4e4984c143a6c142f1cdd39568c90e3de50b58f9310d00f6