Malicious PDF — malware analysis report

Static analysis result for SHA-256 66674c0da5c82be1…

MALICIOUS

PDF

87.6 KB Created: 2021-02-25 03:25:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 46790b32faf9b2b32d428c8f4a8f5e41 SHA-1: 98e7f4240d05708415c3825fb25b194f09519289 SHA-256: 66674c0da5c82be1b0aea43048c79719f3c698f192704a5d93bf12d8901dbdfd
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://crophysi.ru/wix?keyword=chapter+2b+water+answer+key PDF link annotation
    • http://sethel.xyz/what_jacket_to_wear_with_a_navy_blue_shirt5bujc.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/farm_machinery_show_2020_addressm7lfq.pdfIn PDF document text
    • http://stroymarketmetal.ru/182485533612s7v9.pdfIn PDF document text
    • http://gromstroy.com/533979332852zx9m.pdfIn PDF document text
    • http://opticsystem.website/gedixonovemasoqb6jr.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/11748983750.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/39345895968.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/amcas_personal_statement_formattingunwux.pdfIn PDF document text
    • http://bet-info.ru/the_managerial_function_of_controlling_is_defined_asdfwpq.pdfIn PDF document text
    • http://kernig.store/798701938851teav.pdfIn PDF document text
    • http://rezltml.xyz/new_design_for_ppte535e.pdfIn PDF document text
    • http://salet.store/27409459533k5r0t.pdfIn PDF document text
    • http://securityverifiedservices.com/krups_beertender_subypcuc.pdfIn PDF document text
    • http://vnds-super.space/daily_routine_templatesn2mn.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/pawovodajegusavunisuvi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jabodegodonirad.atwebpages.com/quais_so_os_tipos_de_artes_plsticas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF9 5060 bytes
SHA-256: 6fc926007ad425d7fc7e12f86beb0868c149092a6c60fbd4260e41669574a5f4
font_01_sfnt_off0001202c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202C 10220 bytes
SHA-256: a03171efa845d0d4aae48c9588e83549f16390cd471a01247145a806b917fdb1
font_02_sfnt_off0001432b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34