Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53953b9ba016176…

MALICIOUS

PDF

68.7 KB Created: 2021-04-01 10:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5308c8881455eecbc6d7e7de6e1dd118 SHA-1: db23eba046a2b526a0d7d7f46646dc5e5ae395c5 SHA-256: c53953b9ba0161768c559cab83b46c9f12cc23b254e24d7040462fe5fe598f1e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to a site that appears to be a link farm for SEO purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://leonvi.ru/wix?keyword=amazon+prime+apk+for+vu+tv PDF link annotation
    • http://honbiz.pro/apex_legends_file_size_pcy4ve9.pdfIn PDF document text
    • https://cdn.sqhk.co/dekorasenu/jjhhX6j/swot_analysis_template_retail_business.pdfIn PDF document text
    • http://helpforteam.com/fobekutogenarifurabepegijjaqp0.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/mzCifkv/crypto_companies_going_public.pdfIn PDF document text
    • http://bluhgang.best/biochemistry_and_clinical_pathology_bookxi2b8.pdfIn PDF document text
    • http://xtina.online/a_short_guide_to_writing_about_film_9th_edition_freejoe1n.pdfIn PDF document text
    • http://daating19.site/xupuperexajewesazomd29p4.pdfIn PDF document text
    • http://onlinetiser.website/83843346188ws2zc.pdfIn PDF document text
    • http://momentikshop.space/minn_kota_riptide_powerdrive_55_reviewnguz6.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/jdJozWO/adidas_shoes_for_men_online.pdfIn PDF document text
    • http://copyright-services-us.com/forge_of_empires_army_guideteadb.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/rTjhGgi/nezipel.pdfIn PDF document text
    • http://retys.fun/482027502386hzfu.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/jb94baD/flexiroam_x_starter_pack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_cabcddd266f845a3b77994b7afbf9a40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/more_more_amore_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/69314772685.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/birthday_invitation_templates_email.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/56868704595.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/how_to_replace_a_shear_pin_on_a_snowblower.pdfIn PDF document text
    • https://71bfc0c6-4bef-405a-aee6-9e9dcaab3d12.filesusr.com/ugd/708cfd_3cf697e636444c7b9bc42b85029aa6a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bagisi/transferable_skills_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/air_conditioner_types.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/davis_drug_guide_influenza_vaccine.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD088 5000 bytes
SHA-256: 5b64be47ca7313f1229b0dcc4dd4e8de93b4468e95201928e60cdc24961fe505
font_01_sfnt_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 10508 bytes
SHA-256: a78cd8acdd1dfbb005ccb0faaf55dc10adb72c05bba942ed3376bbfabdd953ce

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