Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e835decb6f6b61…

MALICIOUS

PDF

83.8 KB Created: 2021-03-17 06:13:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 29c5af799f9a2b218fb5165a049d4035 SHA-1: 589394e5751613ce4170084f4b14a53a87f0c80c SHA-256: 41e835decb6f6b616f886f2572f271b48a29f172f968727a55fd8b8cdd1781e4
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains and potentially malicious hosting, indicating a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically calls out this behavior. While no scripts were explicitly extracted, the nature of the embedded links suggests the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • 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://ponafet.ru/award?keyword=bottom+ash+properties+pdf PDF link annotation
    • http://dumigegin.medianewsonline.com/jazepaverajeguwozinaje.pdfIn PDF document text
    • http://pebifakonek.sportsontheweb.net/27989231071.pdfIn PDF document text
    • http://juborad.mywebcommunity.org/35214384189.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/ieSWgce/meet_video_conferencing_video_meetings.pdfIn PDF document text
    • http://haustova.com/juxawiludoc7g7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484821/normal_604eb59a213e0.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/RX7gdLI/solewewakor.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/wawuwufasuw.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/fatazirifelutagek.pdfIn PDF document text
    • http://jovasetiveduza.scienceontheweb.net/62702460808.pdfIn PDF document text
    • https://cdn.sqhk.co/mowukirew/jDihhjf/gozod.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/TKet5Vl/79256530126.pdfIn PDF document text
    • http://winoorama.fun/tipos_de_archivos_y_sus_conceptos5puln.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/iciajtD/nfl_sunday_ticket_login_stream.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/taotao_50cc_scooter_maintenance.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_6041c0fcc4ec5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447466/normal_5feb1ec55b836.pdfIn PDF document text
    • http://about-igsupport.com/futolug97rkt.pdfIn PDF document text
    • http://ru-payment.casa/antenna_and_wave_propagation_ebookxmc7t.pdfIn PDF document text
    • http://openlait.pro/samuel_beckett_bridge_designo390x.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/88848736091.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/tozozelimufakob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kabuzore.atwebpages.com/aptitude_test_questions_for_campus_placements.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/how_old_is_my_smith_and_wesson_38_special_ctg.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/arkansas_river_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/jerazezariki.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/60950556650.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_off00010b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 5300 bytes
SHA-256: 9ac067255d6cea3f61fd449a201ffa8807979a41f950ab6adce071376417f684
font_01_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 10644 bytes
SHA-256: 2f23146cc3c3942827e8eb4db5d34345571cfdc89cc57d4eeb22501136e0e5f5