Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb8741763052ac2…

MALICIOUS

PDF

76.8 KB Created: 2021-04-04 08:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dcbc4370c4b39f4dfe9596e61e206deb SHA-1: c9ef26a7c80f797d226e916df31e46c601a06b59 SHA-256: 6cb8741763052ac232ceeed36f6ced5404a835e9f0f50fea0e1520fc675f378a
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, specifically advertising free downloads to entice users. The embedded URL `https://druttle.ru/award?keyword=meteorology+pdf+free+download` is flagged as a redirector for SEO-based phishing. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful content.

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://druttle.ru/award?keyword=meteorology+pdf+free+download PDF link annotation
    • http://cenderaoriginator.com/fukuvisupedegodubekutokane3vo8.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/IiighHC/cool_free_vr_games_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/2aUgehj/roblox_login_issues_ipad.pdfIn PDF document text
    • http://naturebiolog.fun/chiefess_kamakahelei_middle_school_uniforms48fd8.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/aphfAjc/75507618695.pdfIn PDF document text
    • https://cdn.sqhk.co/padirazemi/zrha5GL/space_shuttle_flight_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/hihbViV/9485103066.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/5gc6MgZ/wolf_1080p_wallpaper_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/xegigujatefa/gLLiiBO/music_player_for_android_tv.pdfIn PDF document text
    • http://legendarycraft.ru/the_things_we_carried_chapter_2_summary0cd4l.pdfIn PDF document text
    • https://cdn.sqhk.co/janezewufaj/YnE7gcG/rijeweb.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/faluzotixupi/penixasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3918b64c-0fbd-4dd8-b4ef-b7126d2e1d3d/juvofi.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/72539108425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6978596-ff13-4e7d-9087-6070aa92f4c8/nafunuti.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/what_does_purple_say_about_your_personality.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/lofapaxijudapavifaliwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c3fa04b-2f9c-4955-a1d2-67a128771e6e/beats_solo_3_best_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69763864-ea59-4416-a23d-b8124d2adad4/41466922261.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_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 5228 bytes
SHA-256: a72395336debfe3137818e53dd40c43965644a16e3b6066367a16fea16568da0
font_01_sfnt_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 11052 bytes
SHA-256: 83db0b3717795c18edd6c6556e79100f76d9d57d89322611f14f6fed6cfc55fc

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