Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3dff5bc1fcf5910…

MALICIOUS

PDF

76.4 KB Created: 2021-03-24 22:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 81297ccb9194bd785a8d503bbacfc819 SHA-1: 781f09cb8b44b951bb3ed764f55b03c15cf442de SHA-256: c3dff5bc1fcf5910693c82067299807fdb6833665dd61fb0106d638bd0cbd80f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains text related to essay writing, suggesting a lure to disguise the malicious links.

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/strik?utm_term=how+to+write+a+conclusion+paragraph+essay PDF link annotation
    • https://cdn.sqhk.co/wozobifanu/dtjg9hg/35694275245.pdfIn PDF document text
    • http://jarowulizose.sportsontheweb.net/borexanejajazafuwaxefe.pdfIn PDF document text
    • http://xekalabaxuv.medianewsonline.com/bank_clerk_exam_solved_papers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410988/normal_5fe3a3307b875.pdfIn PDF document text
    • http://wow50.pro/bp_lathi_linear_systems_and_signals_2nd_edition_solutionsxep31.pdfIn PDF document text
    • https://cdn.sqhk.co/sefibenip/iejege8/31154554359.pdfIn PDF document text
    • http://vuvefezod.iblogger.org/plans_to_build_a_top_bar_bee_hive.pdfIn PDF document text
    • http://zodimasar.mypressonline.com/choose_your_own_adventure_online_text_game.pdfIn PDF document text
    • http://nefutekugurenap.mygamesonline.org/isolation_of_aspergillus_niger_from_soil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385011/normal_5fe39011ab8a4.pdfIn PDF document text
    • http://medgaj.com/what_killed_dr_myles_munroeq785g.pdfIn PDF document text
    • http://naxuvazexipok.sportsontheweb.net/berofafexubupu.pdfIn PDF document text
    • https://cdn.sqhk.co/wokinuge/KDgijag/55354770331.pdfIn PDF document text
    • https://cdn.sqhk.co/sowumavag/c9RgzPl/mummy_outfit_assassin_s_creed_origins.pdfIn PDF document text
    • http://pirojibanenuzi.getenjoyment.net/thread_sizes_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_601b8ff758152.pdfIn PDF document text
    • http://zikevamakag.mygamesonline.org/hotsy_pressure_washer_pump_parts.pdfIn PDF document text
    • http://blubadgehelp.net/honda_cr_v_maintenance_code_b127oqxl0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedixiravupit.epizy.com/aotearoa_fisheries_limited_annual_report.pdfIn PDF document text
    • http://dorurefu.epizy.com/destiny_2_solo_raid_guide.pdfIn PDF document text
    • http://sopexalibip.onlinewebshop.net/19090788289.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_off0000ed2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2C 5352 bytes
SHA-256: efbc240d1c55fb4d8ff17b1524820eb8849e501fb63340bb9e6cf555b8f02f4d
font_01_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 10292 bytes
SHA-256: 35cdff8c83ca084e3e319e040ec5c0322afcd5842af41f4b12c6bce59c7e2c41

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