Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58e7d6c50490bdd…

MALICIOUS

PDF

88.9 KB Created: 2021-05-03 02:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6f854c4106fe535d771ebb7e8e976d06 SHA-1: 22303dc9eddb9f7e663e03e3beb2019df140390c SHA-256: d58e7d6c50490bdd93ccb4fa227f0df593cfe79205addd1af9a36e76ca43f002
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration, a common tactic for phishing and malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest an intent to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/strik?utm_term=singer+sew+mate+bobbin+jamming PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393638/normal_600fd57b14798.pdfIn PDF document text
    • http://gativatur.getenjoyment.net/7155204376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_601d972059b1c.pdfIn PDF document text
    • http://cosmicgig.com/astrophysics_for_the_person_in_a_hurry_audiobookmznj0.pdfIn PDF document text
    • http://fastgetme.online/does_charisma_on_command_workkj65q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449603/normal_60009e255c766.pdfIn PDF document text
    • https://cdn.sqhk.co/kolusugego/jjKKgff/chhota_bheem_speed_racing_game_apk_download.pdfIn PDF document text
    • http://mufinofol.scienceontheweb.net/voluges.pdfIn PDF document text
    • http://marketitaly.pro/how_to_write_a_critical_analysis_of_a_journal_articleb6akp.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/dsbgigc/easy_loader_trailer_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/zivalutapa/hBEjcNB/chemical_element_definition_anatomy.pdfIn PDF document text
    • http://jushq.pro/beats_solo_3_wireless_mercadolibreeudya.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386334/normal_606e7ca21e883.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/washington_state_university_ranking_world.pdfIn PDF document text
    • https://cdn.sqhk.co/pasudajuwesa/OhekWja/popular_arcade_games_2000s.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/tivedaramozokiri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421215/normal_604f408e27bf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407314/normal_604c99750f696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486061/normal_604f487619d70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mugomodag.atwebpages.com/credit_card_authorization_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b28f0e17-c5e3-4297-a358-45f379656463/32736083025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd1ef4f5-f3a4-421f-ad6c-882db2059335/formula_para_sacar_el_volumen_y_area_de_un_cilindro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef627f2d-c919-426a-aed7-49ed043b1279/jixigevesiwuwunimiravivit.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_off00011b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 5384 bytes
SHA-256: 0778d11ddb52c078e19b27e62e96a0e85c0356c2ae2f05d9134b47ccd6c4b7e7
font_01_sfnt_off00012d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5C 11540 bytes
SHA-256: 0dd95f356ad1aa2e06bc3126ad1c2ea270eeeb8c0d25d565963951dd4aea3b5b