Malicious PDF — malware analysis report

Static analysis result for SHA-256 561b2a384adb15ee…

MALICIOUS

PDF

69.7 KB Created: 2021-03-16 08:22:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 33828e1b5c724f818141ec7726ebbce1 SHA-1: b01b4bf44168e90a5052d52d8c5e700bde6f9e2e SHA-256: 561b2a384adb15eea1ffcabb253bb199e43619566365f41dd3db43f6065182c3
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains strings related to a Sony product, likely a lure. The presence of numerous embedded URLs pointing to disposable domains and link farms further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/strik?utm_term=sony+mex-n4100bt+open+app In PDF document text
    • http://microbladingcertificationdfw.org/novatomrx67.pdfIn PDF document text
    • https://cdn.sqhk.co/mumeriretepi/PijuAji/red_lobster_menu_nutrition.pdfIn PDF document text
    • http://jilet1.club/zalebokudujilericufb.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/game_programming_patterns_epub_download.pdfIn PDF document text
    • http://geparup.scienceontheweb.net/tp_link_extender_wpa4220_setup.pdfIn PDF document text
    • http://belkwigs.com/gloomhaven_tinkerer_strategy4bwhk.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/how_to_play_a_2_octave_d_major_scale_on_violin.pdfIn PDF document text
    • http://sumapewub.getenjoyment.net/ecological_systems_theory.pdfIn PDF document text
    • http://dabosesavedevet.medianewsonline.com/arena_simulation_software_tutorial.pdfIn PDF document text
    • http://mysteps.online/converting_grams_to_kilograms_worksheetzxnpl.pdfIn PDF document text
    • http://excschool.ru/xowunikw887.pdfIn PDF document text
    • http://artdebug.site/que_es_la_cebada_en_granodsyie.pdfIn PDF document text
    • http://boldly-grow.com/answers_in_genesis_ark_locationtwpl8.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/jjJegji/murder_mystery_party_kit_for_large_groups.pdfIn PDF document text
    • http://segikusi.22web.org/osha_forklift_training_test_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_08f857969b9e46b9b3eeb7f7486db837.pdf?index=trueIn PDF document text
    • http://xomogovi.epizy.com/carne_asada_nutritional_information.pdfIn PDF document text
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_ffc47513ce7f4421977cd43f769b8527.pdf?index=trueIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_6698c619167240c7a4fc261319dd4eb3.pdf?index=trueIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_63e55ab9977f4da0b4c400de70593987.pdf?index=trueIn PDF document text
    • http://dudezafib.rf.gd/research_data_analysis_methods.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_4efc96d7b4894788a67c43fee75788d2.pdf?index=trueIn 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_off0000d2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C1 5388 bytes
SHA-256: db63b85ba8760f2e52fc3f0bb0ae8fa6aafab7fe9ca7c00867f645256291f123
font_01_sfnt_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 11000 bytes
SHA-256: 44619d05c317ed1c3c681ae6cc462a69ba05d68aba065aef7fd1048ef62f5340