Malicious PDF — malware analysis report

Static analysis result for SHA-256 4154bebb8e9ad14d…

MALICIOUS

PDF

89.4 KB Created: 2021-03-19 05:02:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: db552ae490763a049e0ad43dd9967a51 SHA-1: 2549414e38017956aa9e6f6183f4450645091bb0 SHA-256: 4154bebb8e9ad14d8bd978df01ee30910cae6b68cf094c3bddf9c12b0523ad68
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a lure with a "free-download phishing" characteristic, linking to an SEO redirector. The primary malicious URL identified is https://midufefew.ru/wix?keyword=st+math+challenge+big+seed+answers, which is likely used to host or redirect to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/wix?keyword=st+math+challenge+big+seed+answers PDF link annotation
    • http://llloooodddd.space/investing_for_dummies_9th_editionmdvmx.pdfIn PDF document text
    • http://genusadnlo.space/In PDF document text
    • https://cdn-cms.f-static.net/uploads/4459174/normal_5fd655823df95.pdfIn PDF document text
    • http://gnfcns.info/nejedebuguxu1qx5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387589/normal_600f59150bf6d.pdfIn PDF document text
    • http://radanews.site/368824817483gksl.pdfIn PDF document text
    • http://rcasino.info/bomeripapuvovulepozaj31ao.pdfIn PDF document text
    • http://digtalcaliper09.xyz/wizard_how_to_draw_heroic_anatomy_pdrxduv.pdfIn PDF document text
    • http://baltika-trans.com/susasumatufifuzawegnduy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_6017518285dd6.pdfIn PDF document text
    • http://galoomer.online/dugatogomusijwkyw.pdfIn PDF document text
    • http://future-techno.ru/courts_of_heaven_ron_hornerd1k1n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390095/normal_6053d91eb07b5.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/kexamoxusinixu/lewiduwipunogaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/zejefinogaxopum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d4dcd1-f1e1-4039-94fa-071bd79e76b6/vba_code_in_excel_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/sony_android_smart_tv_49_inch.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/66534056380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/621f708d-a9d7-4d40-8fe1-ba37b6f016d8/rf267_samsung_ice_maker_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/10355118302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1766f9ce-ea93-4605-80f7-e71a98cce7c9/most_uncommon_last_names_in_the_united_states.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/121d505f-3432-41c6-8053-2ae92fc80ba0/10427308122.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/informacion_sobre_el_pajaro_canario.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/spongebob_wallpaper_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/world_economic_forum_report_2017.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_off00011aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 5688 bytes
SHA-256: 736680fb5da6199516f5e0b0e999ac3b818539e3111bb76097d8273458d46048
font_01_sfnt_off00012ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDF 13144 bytes
SHA-256: 3ab0b487c3a69f62720a881b0241e762cbdc5bdaf6ae558718dbfe9744a70f92

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