Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd31c0fd607f8fce…

MALICIOUS

PDF

70.5 KB Created: 2020-12-25 20:22:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: c86177a20e016c8a20aa28e662d45fd1 SHA-1: 0b14a21c068ba87a896e2e2fd4e78968b33fe2ae SHA-256: fd31c0fd607f8fce3b7e74c88cdeefdfcaf1d025214816880124b35dd2768730
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/wb?keyword=screen%20recorder%20for%20pc%20online In PDF document text
    • https://cdn.sqhk.co/fijajiles/S8KFKxk/64428949177.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/favunubesepemeruke.pdfIn PDF document text
    • https://cdn.sqhk.co/febenanedibu/hbExE4h/xikirigubegadeximafofas.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/tifuwuw/wizezivusesamixibe.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/47351426611.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/free_context_clues_worksheets_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c672b739-6a5d-45c7-b8d4-2c381af0d58a/ecosmart_eco_27_fuse_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/fixexizupipexidupudenuwem.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/baal_veer_video_3gp_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/lipogaz.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/vumanigokerudedulozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996d27da-b9b5-4d33-9c04-eb298d5b5415/razajifegesuji.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/guitar_hero_live.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/let_it_go_violin_2_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/economic_order_quantity_exam_questions_and_answers.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_off0000d74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74A 4864 bytes
SHA-256: 669d7c0ceff921d59feeaae95f9f474393f2fea5d7a1d4e1257c8a568f67cb68
font_01_sfnt_off0000e7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EB 10544 bytes
SHA-256: 66abb0bd7d2e53960a0924a84b46dc332715a5806fa641d73959b56fd1ead600

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