Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a389f0d4677e26…

MALICIOUS

PDF

80.6 KB Created: 2021-03-28 14:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c40754858cfdba1ddaa51a7e8eb46f44 SHA-1: b34497a582c15effb0b1b6841643133c8f8dd68e SHA-256: e5a389f0d4677e2669b63d12fbac245874978057fe8bb5ebc3198efb90897475
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users by redirecting them to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/award?keyword=bruins+schedule+2020+18+pdf
    • http://lamanixumerad.mypressonline.com/acrobat_editor_download_free.pdf
    • https://cdn.sqhk.co/batumozi/7jbkMja/81661070759.pdf
    • https://cdn.sqhk.co/nowovadizeb/SijX9R5/board_games_for_2-_3_players.pdf
    • http://pexawegowe.mywebcommunity.org/la_motivation_des_actes_administratifs.pdf
    • http://forovasax.medianewsonline.com/microsoft_access_2016_requires_visual_basic_for_applications.pdf
    • http://wojesukuzak.mygamesonline.org/geometric_sequence_real_life_problems_with_solutions.pdf
    • https://cdn.sqhk.co/vonewesipan/dVjcegj/duzogudimi.pdf
    • https://cdn.sqhk.co/xurawupo/hhIjim8/neo_geo_x_gold_game_cards.pdf
    • http://misifebofol.mywebcommunity.org/software_agreement_contract.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pukiza/ropajijewitirabesezufo.pdf
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_54c72f112e514564a6f9cc4f81c44658.pdf?index=true
    • https://s3.amazonaws.com/nezanurugega/formal_email_template_job_application.pdf
    • https://s3.amazonaws.com/kewakuko/59113249177.pdf
    • http://fuguzametekobo.myartsonline.com/cambridge_latin_course_book_1_answers.pdf
    • https://0029a690-d003-4268-bdc7-e74daa5a0415.filesusr.com/ugd/a4b355_f524d351f8f84c6ea33c95b6aba85083.pdf?index=true
    • https://s3.amazonaws.com/jefobexapulow/sharp_lc70le650u_precio.pdf
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_c7b7488a3a0c4552b81052955f2ba9b6.pdf?index=true
    • https://s3.amazonaws.com/falufusu/physically_based_rendering_minecraft.pdf
    • http://kimawawasero.onlinewebshop.net/jack_reacher_never_go_back_netflix_country.pdf
    • https://s3.amazonaws.com/suximawo/baklol_video_full_hd.pdf
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_b1edde3931f243b49f2ce8f2416ebf10.pdf?index=true
    • https://s3.amazonaws.com/pidufozu/kiwufakifagerekano.pdf
    • 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_off0000f08d.bin
2ab6df98d8d594d13c4a841c05f914871e653209da812adab2353bdea23f1ead		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 5292 bytes
font_01_sfnt_off00010285.bin
3b982ef5f38152b8fb1e17f8629935c2e5025a8575401293e96c554a49a3231d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 10656 bytes
font_02_sfnt_off000126f9.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126F9 4324 bytes

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