Malicious PDF — malware analysis report

Static analysis result for SHA-256 66055a67e7da475b…

MALICIOUS

PDF

83.8 KB Created: 2021-03-10 04:37:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f07ef58639965e416fc2697f640cffaf SHA-1: 49aae38fd802cb4bbcc2f64f10889a95eeca065b SHA-256: 66055a67e7da475b029c38481030bcd1bf5885f1bd176beac330e608429d3e8c
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 0.9996

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://xajibur.ru/wix?keyword=deezer+downloader+apk PDF link annotation
    • https://kisagisetiduke.weebly.com/uploads/1/3/4/7/134762251/7b0214f0.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/oster_18_quart_roaster_oven_walmart.pdfIn PDF document text
    • http://nutetuxiv.mygamesonline.org/zasarilomupajew.pdfIn PDF document text
    • http://kindraretterath.com/how_to_write_a_performance_goal_examplesv5t5y.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/how_to_start_a_descriptive_paragraph_examples.pdfIn PDF document text
    • https://dugizixenopiloj.weebly.com/uploads/1/3/4/4/134457585/zinirajikekize_nabixemi_ginozunakiduxeb_ditiz.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/nuragew.pdfIn PDF document text
    • http://usesoda.pro/android_file_transfer_hangs_maciji62.pdfIn PDF document text
    • http://wezutos.iblogger.org/rinitopogopimu.pdfIn PDF document text
    • https://tuwozuzoleza.weebly.com/uploads/1/3/4/5/134509843/8999560.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miwewugewu.atwebpages.com/michael_crichton_timeline_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c9f394c-2fc3-443e-94c3-1c87ea9a733d/why_is_my_roku_stick_not_connecting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a688155-d192-48f7-a72d-1f425efd785f/what_are_the_three_ethical_questions.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/92904243936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f0ab200-3f51-4ff8-9716-eb82eb4a5c4e/75745654403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a93e70ef-bdcb-4f5b-8185-a6a6ad8824e0/wobodepexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca787d10-a9e5-47a3-964e-a1467649a470/mr_coffee_maker_4_cup_bed_bath_beyond.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89dcb62-b866-43c5-9064-79031ea9edde/xopasikogizoki.pdfIn PDF document text
    • http://pakemeza.epizy.com/excel_loan_amortization_calculator_template_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498c6fcb-ecc1-459f-b0cb-cbae354dc448/how_to_tell_baby_gender_from_ultrasound_position.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e31537-4444-4bd6-8329-9afd4450c97d/interior_design_colleges_in_southern_california.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 4980 bytes
SHA-256: 5f2b0af4ec8d33fdaaaa56b4e58bd55df0f44e5afa3f5183ec276f4cdae8afe6
font_01_sfnt_off00010881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 10240 bytes
SHA-256: df606decdcdbfd23abb4cb01b373e0be85929b7258a35c02eacfca22ad92d88d
font_02_sfnt_off00012bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC2 16388 bytes
SHA-256: 2cadb2ae25cea88cb182acc54f62d1c218aef5f2772c4081b94d5d3cddde1204