Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7aab8f280126634…

MALICIOUS

PDF

78.2 KB Created: 2021-04-25 06:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 49a8af623fd27cf7226c12c4f7fd6daa SHA-1: 276cf6872d9570d695f5f3dbae9acb815aa7700c SHA-256: f7aab8f280126634d6c588366f6a72d75f7401f2845aeb8eb095f3807f78143a
134 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing operation. The heuristic 'SE_INVOICE_LURE' suggests a deceptive content theme, and the ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nipisod.ru/strik?utm_term=what+does+meno+mean+in+medical+terms PDF link annotation
    • https://bazafegaxu.weebly.com/uploads/1/3/1/3/131383427/6768100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_6026a634ebb11.pdfIn PDF document text
    • http://tapodozinojet.mypressonline.com/konsep_askep_abortus.pdfIn PDF document text
    • https://cdn.sqhk.co/ramowejub/jihjhgh/minecraft_games_unblocked_3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379485/normal_5ffb69581d156.pdfIn PDF document text
    • http://lenuboza.iblogger.org/cash_flow_statement_explained.pdfIn PDF document text
    • https://doxeraja.weebly.com/uploads/1/3/1/8/131871607/94b0455b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_6068919b4e5bb.pdfIn PDF document text
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/lopadezusodimos.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/jz8geij/birthday_cake_recipe_not_chocolate.pdfIn PDF document text
    • https://cdn.sqhk.co/jutepoxof/ejcgjA3/best_free_fake_gps_location_app_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_60264808a337c.pdfIn PDF document text
    • http://nobukuxokosiga.mypressonline.com/71890372245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378607/normal_5ff2930c99126.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxarulenogu/6igjhie/25199953103.pdfIn PDF document text
    • http://mexefolavizidi.iblogger.org/ielts_speaking_marking_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/sozivowemin/hsenlIA/st_james_infirmary_blues_sheet_music_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujupifirafadus.myartsonline.com/zukariruwukupepoze.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/dell_r710_server_rack_size.pdfIn PDF document text
    • http://jokoligu.rf.gd/86885236204.pdfIn PDF document text
    • http://fopupasefe.rf.gd/appreciation_certificate_templates_free.pdfIn PDF document text
    • http://godimodasixor.rf.gd/cricket_mobile_apps_for_android.pdfIn PDF document text
    • http://zogaxogoraf.rf.gd/millennium_development_goals_summary.pdfIn PDF document text
    • http://vukapolil.rf.gd/bsc_nursing_colleges_in_maharashtra.pdfIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/15015402151.pdfIn PDF document text
    • http://fuvituze.epizy.com/62095308146.pdfIn PDF document text
    • http://pomezup.epizy.com/jovup.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_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 5192 bytes
SHA-256: 3a5af4113fd6769cfaef53354846c9a218afe5a3867fbf42d48d60063eb9556a
font_01_sfnt_off0001058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 11020 bytes
SHA-256: 14ad4db13d558f2ce2049f136dd428801fe012adf108fc5bde4d56a14ec0ff11