Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d950630af801496…

MALICIOUS

PDF

71.7 KB Created: 2021-01-21 14:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: c5de49ae03cb922b17a58d81a3e11be3 SHA-1: bcf11addaa4ccce1d7c7040db466e564e2329697 SHA-256: 1d950630af801496d2100d7c4c43acea3001afc17aab043b2a7f263d403acf77
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://leonvi.ru/wb?keyword=hard%20hangman%20words%20food PDF link annotation
    • https://cdn.sqhk.co/wiluxuko/hblxDih/best_code_editor_mac_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/jdjfWn8/russian_propaganda_posters_for_sale.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/mibuz_lewutolofuk_gekosonu_fetodet.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/dowapekutugirewon.pdfIn PDF document text
    • https://cdn.sqhk.co/pibilebomek/8khiBEt/91302103939.pdfIn PDF document text
    • https://cdn.sqhk.co/velizovatim/gd7gKhd/asphalt_8_apk_obb_5kapks.pdfIn PDF document text
    • https://rudotuvesil.weebly.com/uploads/1/3/5/3/135398110/cec106a4da8428b.pdfIn PDF document text
    • https://cdn.sqhk.co/xawuboma/iegeK2l/nibofesupukirixuwub.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/zarevizebi/61094221934.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/33216522675.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/free_handwriting_practice_sheets_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/android_game_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/88091944392.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/student_achievement_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/duwamigig.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_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 5340 bytes
SHA-256: 9b646f09af825ac7116126a3127584ce553031beda2ec78f7b1aae1c79c2d817
font_01_sfnt_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 11236 bytes
SHA-256: 3bf93c1c513e421ce5abca5ce287f7c41ad3045ec2c3041c67dff8fcf04fe942