Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffce87f76b6959e…

MALICIOUS

PDF

82.4 KB Created: 2021-03-16 09:33:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f17c933ad13b00d3f6d482d84f4b87c0 SHA-1: abd76171a0391681f83841616eef6255496a47bf SHA-256: 4ffce87f76b6959e1b94f805d789be6cfd020648496801485cb50baac906a9a0
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and URL heuristics point to a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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.
  • 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/123?utm_term=intermediate+reading+comprehension+exercises+with+answers+pdf PDF link annotation
    • http://okrasote.info/bose_acoustimass_10_series_5_price_in_pakistan5vcb9.pdfIn PDF document text
    • http://arnautmebel.ru/jekebenenozolw3al.pdfIn PDF document text
    • http://alexandreablog.com/who_makes_the_best_cordless_miter_saw1t0x3.pdfIn PDF document text
    • http://volosaty100.xyz/18127994431x3j5o.pdfIn PDF document text
    • https://cdn.sqhk.co/judigirowe/hfhae0f/skydiving_weight_limit_georgia.pdfIn PDF document text
    • http://otomail.business/1n4007_mic_datasheetwa986.pdfIn PDF document text
    • http://danuseko.iblogger.org/vafebulatotazigavixumafu.pdfIn PDF document text
    • http://fomilexavekol.22web.org/jodi_picoult_change_of_heart.pdfIn PDF document text
    • http://bionatur.space/la_declaracion_universal_de_los_derechos_humanosw3pwa.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/dC4aQgf/92426947139.pdfIn PDF document text
    • http://inter-kalinka.ru/how_to_start_a_ketogenic_diet_planiuf63.pdfIn PDF document text
    • https://cdn.sqhk.co/voguzasijur/whe1hi1/ruxujisisopodejawidibo.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/dhihdjf/fishdom_cheats_445.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/Zgigc4J/lizas.pdfIn PDF document text
    • http://rezonansmusic.com/281929075ibemj.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://sorofakomefus.epizy.com/modelo_de_entrevista_estructurada_psicologica.pdfIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_d05a444ead53467fa804c802b5b2c57f.pdf?index=trueIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_2232a133f4774caeb6d2d217c1bf61c9.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_0c2d508a611646f685b9cae915c06cee.pdf?index=trueIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_1fdecc68b114434a9aefd85763a57c67.pdf?index=trueIn PDF document text
    • https://37459de8-d961-4a2a-897a-801dad55dcfc.filesusr.com/ugd/1395e2_2de76a033e79492091ea6c9afeddf1c1.pdf?index=trueIn PDF document text
    • http://bavolonetokibip.rf.gd/natakarupoli.pdfIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_a8daffe2b8d044bb9ce0bbfde6527485.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_fb868b01751c469f95fd3f9b15166057.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4B 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 5424 bytes
SHA-256: 9d1918e430bcf0df94b467f86d5a49cb162ec19698cdf114df87b4117fe0ee45
font_02_sfnt_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 10576 bytes
SHA-256: 8b7a0681956a335e101a99a3a853908d44694bf3e3f4c2ba753a1ccd179b093b
font_03_sfnt_off00012b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B05 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378