Malicious PDF — malware analysis report

Static analysis result for SHA-256 f461990e274967e1…

MALICIOUS

PDF

72.6 KB Created: 2021-01-26 15:03:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: a8d31dc3ee095577fbe717dae756334a SHA-1: 5400f0f7d77a76fd52dedb6ac3599d0543bf6b2d SHA-256: f461990e274967e168f71f0980302efd9bff50444c01f6cc2ff8550f0fd20d6d
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/123?utm_term=technics+receiver+sa-dx930+manual In PDF document text
    • https://cdn.sqhk.co/solumapidema/Ou9jigi/frozen_potstickers_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_600e9360dfcbc.pdfIn PDF document text
    • https://pukutititoj.weebly.com/uploads/1/3/1/3/131383613/getufutipusigopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480591/normal_5fdac71b65224.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499334/normal_5fc8b3ca12865.pdfIn PDF document text
    • http://streamsweets.com/146922100668npml.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_600a068aeecbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493578/normal_5fed1f92e2ea4.pdfIn PDF document text
    • https://jesepivop.weebly.com/uploads/1/3/1/4/131483445/8845397.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5fe2e946c08d9.pdfIn PDF document text
    • https://mepapezivodeno.weebly.com/uploads/1/3/0/9/130969154/2ef5ea2f0.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/hgdJ7ne/selesujus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481061/normal_5fec197a88750.pdfIn PDF document text
    • http://f13x.xyz/lowitukosimanizutis803jr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418788/normal_600209c92abbf.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_off0000cf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF79 5752 bytes
SHA-256: 6b0affd7869ab294edf918c9df89116bacbfff9b73734dc9a5cabd424e7c1179
font_01_sfnt_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 16608 bytes
SHA-256: 9b1b10b8772b1ca20b29fe3281da657ada93445737ba2acf83b195b19eee3434

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