Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b0bc098e1c5eeb…

MALICIOUS

PDF

73.1 KB Created: 2021-01-22 09:58:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: ebbce0fb485218324af748134e81d800 SHA-1: d0288acda7883e0ed793b24a36f0a73371ba696a SHA-256: b4b0bc098e1c5eeb368f26af9f628ce3d88a27ca930bc5979b37e65c1ac83c15
254 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
  • 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://yafferge.ru/wb?keyword=survivor%20australia%202019%20rope%20broke In PDF document text
    • https://static.s123-cdn-static.com/uploads/4425514/normal_5fefa7283185c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375086/normal_5fcc2e8072a96.pdfIn PDF document text
    • https://vevuduwas.weebly.com/uploads/1/3/0/7/130775740/lokesadasakag_gigofujuto_nilar.pdfIn PDF document text
    • https://site-1254585.mozfiles.com/files/1254585/19917476978.pdfIn PDF document text
    • https://site-1172776.mozfiles.com/files/1172776/79688126539.pdfIn PDF document text
    • https://site-1196465.mozfiles.com/files/1196465/sim_sara_is_missing_birthday_code.pdfIn PDF document text
    • https://site-1178309.mozfiles.com/files/1178309/43576116600.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/hrvnUsA/45035410266.pdfIn PDF document text
    • https://site-1203447.mozfiles.com/files/1203447/wabowuwixisutokusudu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426697/normal_600946b1ee0ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455180/normal_5fe493062f9ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413702/normal_5fcaa8da1f7a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379732/normal_60045004343ee.pdfIn PDF document text
    • https://cdn.sqhk.co/kulizuxekume/ih5oFyS/lodasiwajutudirufetogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5fd27d02cbc4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 5664 bytes
SHA-256: 304111871bb7bd650d2274f44f146bfe336ea761790a5c6a51b43457e8580fff
font_01_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 10704 bytes
SHA-256: 3109d5d66bf7f0c23546a485b81cd424fe2167915b85e446d4b7e828adea8403

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