Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90c3178c2071c60…

MALICIOUS

PDF

100.2 KB Created: 2021-04-08 05:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 837ca0f0e443310b9d5085ae7169387a SHA-1: a93051699e4b918cb31308feb0548e3967fbe775 SHA-256: e90c3178c2071c60cadc4290be43acb5933220ec26a1fb708f2070394d51c56e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a high concentration on disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://fokemale.ru/strik?utm_term=organic+chemistry+for+dummies+amazon', are likely used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://fokemale.ru/strik?utm_term=organic+chemistry+for+dummies+amazon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368229/normal_604a90a01bfc3.pdfIn PDF document text
    • http://tivoraxureb.22web.org/l2_support_engineer_interview_questions_and_answers.pdfIn PDF document text
    • http://hocostyle.ru/36701767220mrwrr.pdfIn PDF document text
    • https://cdn.sqhk.co/rowojazur/0YWLqYz/video_editor_online_free_with_effects.pdfIn PDF document text
    • http://gaximivotekole.mypressonline.com/bhagavad_gita_by_prabhupada.pdfIn PDF document text
    • https://cdn.sqhk.co/zomujugoke/wjfhc2a/84964825277.pdfIn PDF document text
    • http://wezenilokiwuv.iblogger.org/report_anti_social_behaviour_council.pdfIn PDF document text
    • http://serebirupa.iblogger.org/aprender_aleman_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/fZzvKSp/49502241827.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/plywood_workbench.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_60477c04b779b.pdfIn PDF document text
    • http://topchambre.xyz/xozujirowajovabadexefv170.pdfIn PDF document text
    • http://myimperfectmomlife.com/busuu_premium_apk_uptodownpz4sg.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/24445338891.pdfIn PDF document text
    • http://snapchat-alert.com/23438765564g3bzm.pdfIn PDF document text
    • https://cdn.sqhk.co/dobopejig/UigBp4s/green_mucus_poop_pregnant.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxogafu/jjibgiP/notetodo_note_to_do_list_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_efadf77f30a64006918a290db3a03373.pdf?index=trueIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_d9713822a6084f3d8e745e09410647be.pdf?index=trueIn PDF document text
    • http://woxesizefibugel.atwebpages.com/physical_science_grade_10_textbook_download.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_4618df36c2154c84aecedf60206e4a37.pdf?index=trueIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_103112fa0bf1457a9e025ef6c20e5e62.pdf?index=trueIn PDF document text
    • http://jubogaju.atwebpages.com/zuxozoluxadotobeluzutiba.pdfIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_b03e68a9ce65464ca091044f13494eca.pdf?index=trueIn PDF document text
    • http://xuzomiboz.epizy.com/baaghi_2_film_movie_video.pdfIn PDF document text
    • http://fobunedofakane.rf.gd/how_to_annotates_in_evernote.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13067 5580 bytes
SHA-256: c0b7d610478b7627577e07cdbfaf4412aa556d21821524c6de13e2e20915a2e7
font_01_sfnt_off00014346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14346 11576 bytes
SHA-256: 1ea43779b0ca5fc8a25664d6e79e41b5fff78ce7014e6b858d26af32c02c2121
font_02_sfnt_off00016af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AF1 16228 bytes
SHA-256: e85d624a6daf477fd3376ccaf99b7d5ce5cde20b6521de85767f22dc09415c55