Malicious PDF — malware analysis report

Static analysis result for SHA-256 621a6e3de24d3a88…

MALICIOUS

PDF

72.2 KB Created: 2021-02-13 10:48:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 4d77433fd83d113399622cc3e77ade22 SHA-1: 2714aa47d60c7f1c342a37db68516c75b221a3d3 SHA-256: 621a6e3de24d3a88d619410bebffab0a406b6ffa20b8fb92790a4f3bc6181a7c
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wb?keyword=free%20handwriting%20worksheets%20for%209%20year%20olds PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458854/normal_600bdc32c2f3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387819/normal_60088f35df166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383146/normal_601107ea019ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418401/normal_6006a8dd4df8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_6016d468c6b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_5fdc079e9afdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528915/normal_601372d7b44f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422628/normal_5fc8e5953c345.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488336/normal_5ff5134e2c27c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424400/normal_5fc89768b6633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453335/normal_6012786aec39c.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/lomogas/accidents_reported_near_me_now.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/cambiar_contrasea_cuenta_gmail_desde_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/alto_s_lament_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/critical_ops_aimbot_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/10_arbschg.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/anari_film_song_likewap.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/catchphrase_game_answers_episode_4.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_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 5540 bytes
SHA-256: bb3428378e940d0214dd624c77f2cb4672a817f9fc1c1e655cfaa8f641888f17
font_01_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 10524 bytes
SHA-256: 531f29af1c58b84172cb37ef58a020225ffd6ff60218c77103b16bdba5a6ba40