Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be31bdaf22e5c3b…

MALICIOUS

PDF

70.0 KB Created: 2021-02-15 18:54:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 8ef4ee4a5ccab0d25b4e22d684d62abb SHA-1: 42ba28a18991430a6f62639ee5c44dc2e84a0c63 SHA-256: 4be31bdaf22e5c3b677a348204b89ade9e591c9ef23e673a2c40cfe384b5b462
196 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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://maypoin.ru/wb?keyword=brother%20mfc%207860dw%20drum%20error PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464068/normal_5ffb73fd1390e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393028/normal_602519ae3d3c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380695/normal_5ffcb35fc96e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449775/normal_5fefa50248c02.pdfIn PDF document text
    • https://cdn.sqhk.co/bumegukomuza/6ih3cji/60568130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_602a0b1c4a3fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_600fbc2b589a6.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/kenavexugarobogutus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5fd5f582293cc.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/hjiTkFz/a_lucky_coincidence_bdo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369784/normal_5fed66064b9a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482631/normal_5fd3397ff27d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366024/normal_5ff2d1d7de189.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/hhFiigh/6467988856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_5fdb67a3ad826.pdfIn PDF document text
    • http://rituralajozeli.iblogger.org/ginozumofumefejaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonoluripep.rf.gd/nuwowewos.pdfIn PDF document text
    • http://pepojugatidi.epizy.com/el_cerebro_libro.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_off0000d57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57A 5552 bytes
SHA-256: 22fe415d5352d406bea157900b2a8d4f49ae6a064610eac01fc3a51d1bb597b7
font_01_sfnt_off0000e858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 10160 bytes
SHA-256: aa07fe530698affddc222c28b877cbd05f299cccd49c40627af544e0db5ff09c

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