Malicious PDF — malware analysis report

Static analysis result for SHA-256 53481df954de16fd…

MALICIOUS

PDF

72.3 KB Created: 2021-04-02 14:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: eadaaec1f236fd20b7eb14db378ae545 SHA-1: 57023facd36115e56668c22d3681343550a63a88 SHA-256: 53481df954de16fdcd0de3b776d81451f60fa3171a8d195d3aa044340b723645
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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://gimoguvi.ru/wix?keyword=congruence+and+rigid+motion+worksheet PDF link annotation
    • http://megalit-korolev.ru/todixesarugxd6si.pdfIn PDF document text
    • https://tokuguzeg.weebly.com/uploads/1/3/4/4/134464653/vixikisino_bekepimi_lenenanuzedu.pdfIn PDF document text
    • http://5dradio.ru/why_looks_are_the_last_bastion_of_discrimination_answersnv3wk.pdfIn PDF document text
    • http://datavefa.iblogger.org/3815635403.pdfIn PDF document text
    • http://salonvarna.com/754939605315603f.pdfIn PDF document text
    • http://insurancesouk.com/bezeziwotomilunowaxlmtk.pdfIn PDF document text
    • http://yognat.space/fujifilm_xt3_user_guideqm207.pdfIn PDF document text
    • http://logvoz.ru/rudolatedutopujo1321u.pdfIn PDF document text
    • http://matorebaxemipiv.22web.org/how_to_download_adobe_flash_player_on_toshiba_laptop.pdfIn PDF document text
    • http://kamini33.ru/16735429162evgx4.pdfIn PDF document text
    • http://goodshopsales.xyz/college_algebra_2nd_edition_julie_millery9vra.pdfIn PDF document text
    • http://center-san.ru/flowchart_shapes_and_their_meaningsifz0g.pdfIn PDF document text
    • http://bodyita.space/vunitzb7w5.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/58320142509zk8wu.pdfIn PDF document text
    • https://sisuwupuwadigif.weebly.com/uploads/1/3/1/4/131437471/giledimagusarobe.pdfIn PDF document text
    • http://it50life.pro/paxarmae9o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_1e193fb88aa842ba8cd0c664e9b38382.pdf?index=trueIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_b44cc761fd3741699ef0d90b1ee59de7.pdf?index=trueIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_22ac4e48aa8b48198305700b76b33712.pdf?index=trueIn PDF document text
    • http://gijuvove.epizy.com/corrugated_iron_sheet_houses_in_kenya.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_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 5380 bytes
SHA-256: 97dde2e46614d6106a6432996e889ba1fe7d3523a8eca366a7fc8e6296a3d16b
font_01_sfnt_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 11008 bytes
SHA-256: 098373a2bacf1b7125796933991cfeb94dbcf6cba9f86867fb0c24b97ace4187

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