Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad26ff61e48724ed…

MALICIOUS

PDF

71.6 KB Created: 2021-02-11 23:03:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: ce7d5a9976acb7f4f451b0ea308b24dc SHA-1: f9e833ded0e4203a3f5d0c0968a3e6732d59b266 SHA-256: ad26ff61e48724ed9b68488223cda60f5a4f64363a1f2affeaf7e5358df36a35
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=reading+explorer+2+2nd+edition+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4446759/normal_5ff346f07a8c0.pdfIn PDF document text
    • http://yeswins.space/biografia_de_camilo_cienfuegosiheue.pdfIn PDF document text
    • http://avtoshtorki.shop/home_republic_chambray_cotton_sheetscgwz5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487927/normal_5fe9bec536232.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445325/normal_5fecf43340988.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452377/normal_5ff031444812b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5ff544ed93c33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469351/normal_601e85f396b3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425229/normal_600a83fab87a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501503/normal_5fc767df76edc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403818/normal_601da1c12eada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450896/normal_602232b950ab4.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/6e159ca32e797.pdfIn PDF document text
    • http://fruct.space/bastien_piano_basics_primer_a4dpzp.pdfIn PDF document text
    • https://zoguripan.weebly.com/uploads/1/3/1/0/131070442/33988a0e58d345.pdfIn PDF document text
    • http://trokot-shopnew.online/adjektivdeklination_ohne_artikel_bungen_online0z3tb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424985/normal_5fc69cb32bc05.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_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 5236 bytes
SHA-256: 755d9898eeb847460105e22f414452ba5ed5ebb6cbe626b672fb536a3a05870c
font_01_sfnt_off0000e7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 14104 bytes
SHA-256: ca507cb7c0ae158bad6ddee3d3a94e6f0e4904b12745d35954636304489b99bb

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