Malicious PDF — malware analysis report

Static analysis result for SHA-256 942166ae788d3f97…

MALICIOUS

PDF

77.5 KB Created: 2021-03-14 19:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1ee01e7564a7b594e9393976813e029e SHA-1: 54b1ecabf7f2a7dd6cedacf5a9c60e39758a96b4 SHA-256: 942166ae788d3f9728b2a742baf2adf8cf2eb67a568926401296d7511b58f651
226 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF contains a heuristic indicating a lure to copy/paste clipboard content into a shell, suggesting an attempt to execute commands. It also hosts a large number of external links, many on disposable domains, pointing towards a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://kuzutuzo.ru/123?utm_term=command+line+tools+for+xcode++mac PDF link annotation
    • http://docita.fun/18999405247brtwq.pdfIn PDF document text
    • http://puveputado.sportsontheweb.net/the_spook_who_sat_by_the_door_blu_ray.pdfIn PDF document text
    • http://energierecrute-emplois.com/miessler_and_tarr_inorganic_chemistry_3rd_editionh89cl.pdfIn PDF document text
    • http://vipmanmarket.space/549500331255xc0w.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/jdALmPF/cowboy_chicken_recipe_keto.pdfIn PDF document text
    • http://jivavesomuviz.getenjoyment.net/what_is_the_hindi_meaning_of_pentagram.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/ia7hikI/71298596004.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/EZheGcW/juzuxod.pdfIn PDF document text
    • https://cdn.sqhk.co/ladetozuxi/dhfhjge/what_will_big_bang_theory_cast_do_now.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/0jigcge/colored_pencil_picker_the_ultimate_drawing_tool.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/bVhcTv6/best_dance_music_70s_80s.pdfIn PDF document text
    • https://xuropowupenuba.weebly.com/uploads/1/3/0/8/130813979/joruvutijovuj.pdfIn PDF document text
    • https://cdn.sqhk.co/bowazeduz/gdDjhhj/66134392749.pdfIn PDF document text
    • http://bizbize-yeteriz.org/luth_school_of_nursing_past_question1s19r.pdfIn PDF document text
    • https://dopapixe.weebly.com/uploads/1/3/1/3/131383645/padabijiv_dofasufis_tafabogizudam.pdfIn PDF document text
    • https://cdn.sqhk.co/kisilusotuke/KdWSPje/92091868415.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/nJYhfhI/free_reading_comprehension_games_for_3rd_graders.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/hhhaShj/lagu_guilty_crown_op_1_full.pdfIn PDF document text
    • https://cdn.sqhk.co/pibilebomek/gcwhaia/tubaxomuvudujufumefunize.pdfIn PDF document text
    • https://cdn.sqhk.co/xosujopi/hdgitja/satigup.pdfIn PDF document text
    • http://dkshlyap.ru/arb_association_risk_assessment_templatedjm7v.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://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_off0000e368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE368 5044 bytes
SHA-256: dc0009edc2d2660d217f5ed4c2a9d73619cd0fa46d0e6dc0950445240f6b4908
font_01_sfnt_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 11176 bytes
SHA-256: 80b5423b46916aa2de190055156bc97c40738bd9b4124ec1be180ffee8bde6ae
font_02_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3