Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec77321e86a268a4…

MALICIOUS

PDF

62.8 KB Created: 2021-02-03 12:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 8f59ce3b82a1227e2338f6bd27d0f7c5 SHA-1: 5f258ef46908f94d42313a9893a4c05b6c13f2e6 SHA-256: ec77321e86a268a460e53479f75ecdd8a853d93f4261debc926b0a23f861c601
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=howard+college+blackboard In PDF document text
    • https://static.s123-cdn-static.com/uploads/4388416/normal_5ff699aa7e8df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452157/normal_5fd34ae48b2b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402711/normal_5fcb2e038ed4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421478/normal_5fe731c7e3528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369901/normal_5fcee68e72c98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372086/normal_5ff2201642f65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491669/normal_5ffde73b3b56a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469633/normal_5ff90123f0815.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480145/normal_5ff5260ece535.pdfIn PDF document text
    • http://silkhfig.bid/80055827451k09pr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455374/normal_5fe25a95d0a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476281/normal_5fe7e06f77368.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489587/normal_6004509754e4a.pdfIn PDF document text
    • http://sorulaxawo.iblogger.org/baby_boy_shower_card_template_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xolazituvote.epizy.com/37476443653.pdfIn PDF document text
    • http://zubixuguse.epizy.com/tefixe.pdfIn PDF document text
    • http://batogejupimole.rf.gd/nuximasip.pdfIn PDF document text
    • http://daporanil.epizy.com/41249680338.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_off0000b879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB879 5184 bytes
SHA-256: 096a5dec8fc09212000093bbb4a362129627a5cd5165c49a0f9f17b0f3251118
font_01_sfnt_off0000ca3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 10832 bytes
SHA-256: 146e2af1021a4bd98cfba16b98a0fbea2c524dc79efed87d8304143797c8146b

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