Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f787e2c6d6cbd11…

MALICIOUS

PDF

86.2 KB Created: 2021-03-31 19:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 249973d8036f75e3c45739a73e0e9f30 SHA-1: 559d85f3266cbcfe3872f6863e6451583e0eaeb0 SHA-256: 9f787e2c6d6cbd1129c5072620b2f9294cfb44cb32b9c575739fb5c1d5239025
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall detection by security tools strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://seumenha.ru/award?keyword=chemical+names+and+formulas+quiz+pdf PDF link annotation
    • http://igonlinesupport.com/istanbul_niversitesi_dev_kapa_wordn60tz.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxamipuxum/cDSgeia/best_3d_platformers_on_switch.pdfIn PDF document text
    • http://hyipinvest.site/42189893744kk3ye.pdfIn PDF document text
    • http://eurozone.pro/34483285024ypfof.pdfIn PDF document text
    • http://lidudopunabiril.22web.org/tolitewuxomaxolofog.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/Qxggtid/rixipazosofipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454821/normal_60314e95f3f55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_601b03b090e4e.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/igjerjg/cars_movie_toys_mater.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481821/normal_6010c4d25180e.pdfIn PDF document text
    • http://vovodofozufora.iblogger.org/bojikozelolejovedewo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479446/normal_600003d26552f.pdfIn PDF document text
    • http://1xbet-regi.site/samsung_j7_secure_foldergp8o5.pdfIn PDF document text
    • http://zimejitudik.iblogger.org/brevet_2020_pondichery_maths.pdfIn PDF document text
    • https://cdn.sqhk.co/wunemuruk/SDs3hiU/jedawugikeba.pdfIn PDF document text
    • https://cdn.sqhk.co/fabokofe/fXJTWqo/carnival_games_at_home.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b5c0e3-fef9-48a2-ae53-1a21cb6c29d1/how_to_make_origami_heart_step_by_step_instructions.pdfIn PDF document text
    • http://vomovawesojuti.epizy.com/77090088570.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/91664314903.pdfIn PDF document text
    • http://sewewixa.epizy.com/48183499323.pdfIn PDF document text
    • http://vizebafep.epizy.com/flight_test_guide_instructor_rating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc78054-0aac-4c92-bff4-17986f2c3951/black__decker_silver_12-cup_programmable_thermal_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8baf15-37b0-4861-b811-b8660f6b2d09/where_is_the_reset_button_on_a_samsung_refrigerator_ice_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89fceac9-0952-4dd8-833b-6862541f7b27/how_much_does_it_cost_to_join_a_football_academy_in_nigeria.pdfIn PDF document text
    • http://rodiwube.epizy.com/full_movie_free_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bfab82b-1551-496d-ab6c-6434233e9a01/how_to_setup_swann_security_camera.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 5476 bytes
SHA-256: 50f0889b78ae15d440e342199105fba743ac070cae0a36c5fa4907f8d375bc39
font_01_sfnt_off00010c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 12112 bytes
SHA-256: 6b495ace2ad6c9a6188f5bb7c480104c18be4ad277eaf3c867610cc2f7df383e
font_02_sfnt_off0001348f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348F 16408 bytes
SHA-256: 5e03a443d68fff3191b0aefd2e155d51a1e62ecd4771e690b4fd76e308d0de0f