Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a656e2f535442b…

MALICIOUS

PDF

66.3 KB Created: 2021-03-04 02:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 35ad7da42f78b5da3a616fb9fd4ebbdc SHA-1: 654f019460a938cf3b4b40045b8fda9a8b3ec005 SHA-256: 19a656e2f535442b892b5f0fdd0200ec71a1112082e2b22be577d67e71721cd5
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://dafemum.ru/wb?keyword=many%20rivers%20to%20cross%20guitar%20chords%20and%20lyrics In PDF document text
    • https://cdn-cms.f-static.net/uploads/4464850/normal_602efabdd8e39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497372/normal_5fe4f3032aa26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389095/normal_5ff264d4be198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415742/normal_601601cf1b37c.pdfIn PDF document text
    • http://samo-katim.ru/codashop_philippines_apk_free_downloadjr2jt.pdfIn PDF document text
    • http://nickned.me/matematicas_financieras_anualidades73guk.pdfIn PDF document text
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/eff3b105da223e.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/jupevuxirapi/rijozubavirutavu.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/57063462373.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/66928351187.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/54924884145.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/jutuxetuzosinesuwabasev.pdfIn PDF document text
    • http://ferefifadiziv.rf.gd/96747986185.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/video_speak_up_dilemma_kehidupan.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/brighthouse_variable_annuity_series_va_performance.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_off0000c71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71F 5368 bytes
SHA-256: 490b8df7ef9c20016bb9c74274888fc6dd37e614e920d2fd0fb9ecafd2542c69
font_01_sfnt_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 10092 bytes
SHA-256: 96f7fd4e17f24c6f27623631d9243248ded0aace56f4a4108328f5e7aee7825d

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