Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d922cedbe72f7e…

MALICIOUS

PDF

75.2 KB Created: 2021-02-20 02:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: a39cd400e970c5b37d6b36d347dc7c39 SHA-1: a5d0eaf935a2c250fc3b5d320d459e4466c1b57a SHA-256: b4d922cedbe72f7e0f1f1c622ca86aed7497c7cf39a66d21db8d1635c8658edc
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/123?utm_term=black+skin+white+masks+chapter+5 PDF link annotation
    • http://erogan-oficial.site/billie_eilish_brother_nameihkrl.pdfIn PDF document text
    • http://antonioit.space/82061147130ul7pm.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/nutuminavuseba.pdfIn PDF document text
    • http://cz-nitrof.website/sword_and_sandals_2_unblocked_hacked68ejs.pdfIn PDF document text
    • http://wersita.space/66609460536nbarr.pdfIn PDF document text
    • http://andyhong.blog/semedolifuromamelai7dms.pdfIn PDF document text
    • http://forsage.pw/vobuwagadetopogenejele0rnp6.pdfIn PDF document text
    • http://worldworkbook.com/corporate_bylaws_template_georgiakx45r.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoxoka/ihpjahz/car_driving_simulator_unblocked_games.pdfIn PDF document text
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/2f5879aea.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/wusone/windows_10_compatibility_report_remove_installation_media.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/asaleo_care_annual_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/elliptical_proform_trainer_7._0.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/kindle_cloud_app_for_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/sundered_skies_character_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/angana_padharo_maharani_dj_vicky.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/ramawe.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/aluminum_sheet_cut_to_size_uk.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_off0000e8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 5500 bytes
SHA-256: 1115287eac1df3e276b4ebf8fd97af527803cce216eb019089af22e6207ff056
font_01_sfnt_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 10764 bytes
SHA-256: 4a568fc4e9b299e6355b55b4aa7c4dd503c98e6ada4ce9200f4d53c45d4838f1

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