Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9a0f60e5047a07…

MALICIOUS

PDF

70.0 KB Created: 2021-02-16 09:58:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: ae291580fa34a0933f2b295d9347ff95 SHA-1: c3f4e0e1bd9c1e533e6af067c2dfea5b984bde33 SHA-256: 5e9a0f60e5047a072d8066507614b2858c9c1a1beac3ecacaada9e0d3826aeea
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://crophysi.ru/123?utm_term=pre+op+note+appendectomy In PDF document text
    • https://static.s123-cdn-static.com/uploads/4417129/normal_5fcf4372bf41e.pdfIn PDF document text
    • http://aarbuz.space/depopepinfg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467003/normal_5fce35b439fee.pdfIn PDF document text
    • https://kelesidudukakub.weebly.com/uploads/1/3/5/3/135340861/d1aaa9aa753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503617/normal_60216aefa8bab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_60178a2524e21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384307/normal_5fcb76302f465.pdfIn PDF document text
    • http://soldonlittleton.com/year_8_math_worksheets_with_answers03uwp.pdfIn PDF document text
    • http://cmb-eco.com/votesejedopa14810.pdfIn PDF document text
    • http://on-arenas.com/sears_tools_made_in_usaksgp2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_600a56f66b424.pdfIn PDF document text
    • http://sale20.site/kuxegagsjivp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453754/normal_5fc8dcb995174.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/seriposuj/background_png_blue.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/team_stages_forming_storming_norming_performing.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_off0000d4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 5112 bytes
SHA-256: d66d8fd4ea885c8b373d2fcc23ad767bb29c330911a6e1566326e68693620844
font_01_sfnt_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 10896 bytes
SHA-256: ef831d1c8915b2254a98e56029d062a758c901330022fa90ef730b6a2b210893

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