Malicious PDF — malware analysis report

Static analysis result for SHA-256 d756a73a9494efe6…

MALICIOUS

PDF

95.5 KB Created: 2021-03-15 20:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bee6353077ba9bb3bb0ecbb03d4f79a SHA-1: d168c25d3471fc5c874ccbbad66f1edff938108e SHA-256: d756a73a9494efe617ba6d43cebe350c5c1faf5a2f8631c4d7678c77465cd0d3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV also flagged the file as malicious, indicating a high likelihood of malicious intent. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=ebmt+scid+guidelines
    • http://govugododuwo.iblogger.org/schistosoma_mansoni_ciclo.pdf
    • http://nuvotana.22web.org/rosetta_stone_faqs.pdf
    • http://penageli.getenjoyment.net/70096853420.pdf
    • http://tusiteguluvora.getenjoyment.net/pride_and_prejudice_movie_1995_vs_2005.pdf
    • https://cdn.sqhk.co/kigudukolon/PifjaOW/confrontational_naming_worksheet.pdf
    • http://zijimesaxa.iblogger.org/de_quervain_s_exercise_sheet.pdf
    • https://cdn.sqhk.co/movumatoz/v6ghTjb/best_credit_card_manager_app_ios.pdf
    • https://cdn.sqhk.co/xenumobavun/n2WM7jg/liwanimorugegowositedibol.pdf
    • http://gixodugesu.medianewsonline.com/deh-150mp_pioneer_manual.pdf
    • https://cdn.sqhk.co/dewozoju/8ggWhgZ/iscrap_app_2012.pdf
    • https://cdn.sqhk.co/noviraxat/UEjjubp/feeding_frenzy_2_big_fish_games.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_fbc5424eb65d4baaa0036b1f494d97f1.pdf?index=true
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_f60d4a9e64de4f6e86585aa6cd954a57.pdf?index=true
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_4c3e5ffc1fae4f578843e07f2c84f231.pdf?index=true
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_302a139740de42e9bb554affe7d293e7.pdf?index=true
    • http://vomematomeze.epizy.com/16787116332.pdf
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_37c3b9ed441e4ebc91e1d45b9eec041a.pdf?index=true
    • http://bigapenegig.atwebpages.com/big_ideas_math_algebra_1.pdf
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_9f5d327ab914433681766fce57240a35.pdf?index=true
    • http://xezinupuwe.epizy.com/38856449563.pdf
    • http://xuvekixofeku.onlinewebshop.net/how_to_turn_volume_down_on_adt_panel.pdf
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_8e20d1b50d124934aa3f6e3f4c82fcdf.pdf?index=true
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_f2c4c6bdde22429cbc270c175fc86e3f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bd4.bin
988e06284c583fe55ece521fee3bdf0d91cef23d9e1d19521a3b66955d59499c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD4 4820 bytes
font_01_sfnt_off00013c26.bin
44a79fee9408cb9e8f3793952b1c5ac83966794bc14ac80a4d339fe14d70db83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C26 11424 bytes
font_02_sfnt_off0001629d.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1629D 4324 bytes

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