Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb32cc579ec42068…

MALICIOUS

PDF

84.4 KB Created: 2021-03-17 07:25:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 48bddbd88e260ae1fdb8520d15bd903c SHA-1: db7115e86348925145432dc9bb043bae5f876dd1 SHA-256: cb32cc579ec420688c1950b5b79f41af3471e63f201055205f501f9602ebab28
136 Risk Score

Malware Insights

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

The PDF file contains a lure related to time management, but the embedded link redirects to a phishing site, as indicated by the PDF_SEO_UTM_REDIRECTOR_LINK heuristic and the ML_NYX_PDF_MALICIOUS classification. The ClamAV detection further confirms its malicious nature. The primary IOC is the redirector URL, which is likely used to host the phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=how+to+manage+your+time+at+work+effectively PDF link annotation
    • https://cdn.sqhk.co/gonolesuzam/Mgiib87/ganeru.pdfIn PDF document text
    • http://mudixefibewab.mywebcommunity.org/dog_man_books_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/b8U9jcj/vatibibe.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/roxisimudijuradaxuz.pdfIn PDF document text
    • https://cdn.sqhk.co/tusumawibe/hghiahi/95443309806.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/yibfjhF/vabozevopuwibuseki.pdfIn PDF document text
    • https://cdn.sqhk.co/bamopilu/4jj4oib/cash_app_card_activation_problem.pdfIn PDF document text
    • https://cdn.sqhk.co/giripiponi/heijNgp/ninja_knife_name.pdfIn PDF document text
    • http://pidusejop.medianewsonline.com/beckett_graded_card_price_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/NicOhgS/31897026927.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bezorito/14714146622.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/lyric_video_template_final_cut.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/best_wallpaper_app_for_android_phones.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/brother_ce_4000_sewing_machine_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/faluborus.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/53441333860.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/download_brother_mfc-7860dw_printer_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/avere_accesso_alle_informazioni_in_inglese.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/shop-vac_pump_vac_ssp16-600c_14_gal.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/idsa_hepatitis_b_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/85810688434.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/android_auto_apps_missing.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_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 5300 bytes
SHA-256: e89680385ff858d89d2721b34151601f8fd44c4804a40d6fa3ed838ae2140055
font_01_sfnt_off00011d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D49 10812 bytes
SHA-256: 67eacbae8fd1b0e2c4546ed3b607e69f50e07498b2343d6aa45328953b6b3d4f

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