Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c92aa78c08ee67…

MALICIOUS

PDF

76.5 KB Created: 2021-02-06 12:07:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b02e3aaa8025ba36ada138b7a06fbd5b SHA-1: bb0df6e33c2f76c16148a48feeac78b9a1fd4ffc SHA-256: 97c92aa78c08ee6773858bd3707f4f29e6fd5833af11993d8ded1e63f297f842
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to 'baarspo.ru', flagged as an external URI. Heuristics indicate this PDF is a link farm on disposable hosting, designed to mislead users. ClamAV and ML classifiers confirm its malicious nature, specifically identifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=the+success+principles+by+jack+canfield+summary PDF link annotation
    • http://tazikuruwuwozu.22web.org/85848255716.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/ajc9hgD/94032802330.pdfIn PDF document text
    • http://fukikenikiru.22web.org/49526785245.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jidibavozajo.epizy.com/58717939355.pdfIn PDF document text
    • http://giwofigu.epizy.com/85106897172.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/adobe_photoshop_elements_14._0.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/qualified_audit_report_on_going_concern.pdfIn PDF document text
    • http://bebinuvejaxate.rf.gd/aspiracion_liquido_amniotico_meconial.pdfIn PDF document text
    • http://vusevupitiwo.rf.gd/52726533830.pdfIn PDF document text
    • http://biwisuzasasare.rf.gd/barorreceptores_carotideos.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/40705762466.pdfIn PDF document text
    • http://watekiz.rf.gd/business_development_planning_template.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/el_alcoholismo_es_hereditario.pdfIn PDF document text
    • http://zosanugu.epizy.com/46958331042.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 6548 bytes
SHA-256: 4200db6c0e80cadcb5e6095e2db64c6b33cb2c0480475197fd4329a98774db8e
font_01_sfnt_off0000eb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB19 5728 bytes
SHA-256: 79b7d738453f92b4d68fcf6623591801e9e42f060444de50b3ed7a4b9ec10196
font_02_sfnt_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 10664 bytes
SHA-256: 06a10117fed6458d689b1eddf83e0f779f3b73cc91b3783d46351399d7c606f3