Malicious PDF — malware analysis report

Static analysis result for SHA-256 4411cb4a003c1c75…

MALICIOUS

PDF

76.0 KB Created: 2021-03-17 01:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 04cc8e38e8e41e479ff1b15ffb4681b1 SHA-1: 5ab78bd0bf365475d311a1f0e4d5603e1f2629fc SHA-256: 4411cb4a003c1c750a90222ec4f24cede9659a94047fbb28a094b264c7a529fd
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs, including one pointing to 'vilenefex.ru' and another to 'zdorovie-vashe-vse.xyz', suggesting it is part of a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of embedded URLs and the overall structure indicate a likely attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://vilenefex.ru/award?keyword=2020+telugu+calendar+pdf+download PDF link annotation
    • http://zdorovie-vashe-vse.xyz/5th_grade_social_studies_worksheetsco0xk.pdfIn PDF document text
    • http://wijotit.iblogger.org/citadel_color_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/hhWjaxH/63084650803.pdfIn PDF document text
    • http://felesatediz.medianewsonline.com/gce_o_level_mathematics_notes.pdfIn PDF document text
    • http://kelirajisob.66ghz.com/bsc_modern_physics_notes.pdfIn PDF document text
    • http://muzumekowasisig.iblogger.org/gregorian_chant_sheet_music.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/zabikazipafo.pdfIn PDF document text
    • http://lngcliente.com/91884049910wh010.pdfIn PDF document text
    • http://help-bluebadgecenter.com/pixetokufujipewumepudloth5.pdfIn PDF document text
    • http://favunewesazut.sportsontheweb.net/nololufometuxexemomujib.pdfIn PDF document text
    • http://dihtyar.online/prentice_hall_modern_world_history_textbookq1i6q.pdfIn PDF document text
    • http://pirizatifi.iblogger.org/rozaxowadetezosokewawida.pdfIn PDF document text
    • http://greatholl.com/what_happens_in_chapter_14_of_watsons_go_to_birminghamg9eig.pdfIn PDF document text
    • https://cdn.sqhk.co/xaderipamuva/jq1jcgj/burn_your_fat_with_me_voice_actors.pdfIn PDF document text
    • https://cdn.sqhk.co/kewebogi/qJjcgg1/casino_slot_games_free_play.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/appendicite_aigue_emc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwukoge.rf.gd/pibakolepe.pdfIn PDF document text
    • https://9c50f6df-e9c1-453e-a208-eff1cefe231f.filesusr.com/ugd/44b3dc_587f7148c58044db8772bfeff42d835a.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_70afb99a20564e07ba9ac5e134d5d567.pdf?index=trueIn PDF document text
    • http://nogobixa.epizy.com/sanerupireba.pdfIn PDF document text
    • http://bodudubabafixe.rf.gd/70720770894.pdfIn PDF document text
    • http://bivuraxut.rf.gd/62028063310.pdfIn PDF document text
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_ed7c82170626459ebca5676e1d06d25a.pdf?index=trueIn PDF document text
    • http://xidalagep.myartsonline.com/68925450170.pdfIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_88b052902557484982ec5203b10df8d4.pdf?index=trueIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_6d66217d03704f298974bbe432549b12.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 5416 bytes
SHA-256: 4c0bc325818ce133b37ce13bbdf1f61d73e9d176d3aa6a4a9fb8ae5f17ac4fd4
font_01_sfnt_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 10568 bytes
SHA-256: e7a96c160d1c98751305d173d3b31bbf5ee3ac1ceb20dda223f0831f5e52bd6e