Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df80bcd87040c44…

MALICIOUS

PDF

68.0 KB Created: 2021-04-02 01:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0420bdef462aafe95999c904b92b787c SHA-1: 55f88c6132943dd5066e63e60420d55165e2ca1b SHA-256: 8df80bcd87040c440b284e8ce4504c326340ee8ff81f6981da2618ddc197f359
166 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://zajinet.ru/wix?keyword=inscribed+angles+worksheet+doc PDF link annotation
    • http://xalowazejadiv.getenjoyment.net/modern_calligraphy_workbook.pdfIn PDF document text
    • http://difipalilif.scienceontheweb.net/78476087405.pdfIn PDF document text
    • http://pepariravifaza.getenjoyment.net/81309490500.pdfIn PDF document text
    • http://xokenijogowupe.22web.org/adding_footer_to_excel_sheet.pdfIn PDF document text
    • https://dezuximoloxesar.weebly.com/uploads/1/3/1/4/131410685/2f9e6ff744089.pdfIn PDF document text
    • http://namafafiteg.mypressonline.com/is_s_curl_good_for_natural_hair.pdfIn PDF document text
    • http://reveruverof.medianewsonline.com/27070305486.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/haart_therapy_for_hiv.pdfIn macro / runtime command snippet
    • http://warixedivukinat.mygamesonline.org/gran_canaria_bus_map.pdfIn PDF document text
    • http://kisuvok.scienceontheweb.net/mitowi.pdfIn PDF document text
    • http://autocredit.moscow/28982744800g2xf0.pdfIn PDF document text
    • https://jubaluwaruzazux.weebly.com/uploads/1/3/2/7/132740890/cbdb522ee4.pdfIn PDF document text
    • http://tryplafond.xyz/family_feud_game_applicationxdzn5.pdfIn PDF document text
    • http://reveruverof.medianewsoIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/78635821008.pdfIn PDF document text
    • http://ruvibeli.rf.gd/the_zookeepers_wife_full_movie_in_hindi.pdfIn PDF document text
    • http://pakoxerevigere.epizy.com/37685018455.pdfIn PDF document text
    • http://liwetagosozel.onlinewebshop.net/87048649144.pdfIn macro / runtime command snippet
    • http://pikaderobiw.atwebpages.com/12873903222.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_off0000cc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC27 5432 bytes
SHA-256: 9373d8f0d39ad239f44d40815463cdd80f5c46c8d106f84fcbe45104f8a3e187
font_01_sfnt_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 10024 bytes
SHA-256: 5c621a109fb83c79a59ad8d4d8af50dcfea33c81803fd50142918209da87f3b7

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