Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8a5d2d4285887f…

MALICIOUS

PDF

68.1 KB Created: 2021-01-26 22:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: dc8af68aba3c97ce764896d5dafe42ef SHA-1: 791e4cd4a7e8ee29c81fe93b7543394066f2fb21 SHA-256: cb8a5d2d4285887f64a61211e7d8fa5ffac9a6623ce1244da0371a61fa074387
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://baarspo.ru/wb?keyword=helicopter%20crash%20today%20news PDF link annotation
    • https://fomemifeju.weebly.com/uploads/1/3/4/7/134769467/jewan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382778/normal_5ffa2763e7a56.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/degomun.pdfIn PDF document text
    • https://subowenove.weebly.com/uploads/1/3/2/3/132303013/4472181.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwufeguv/hibijay/27897428493.pdfIn PDF document text
    • https://dikivofugejal.weebly.com/uploads/1/3/1/4/131453076/ef1528f.pdfIn PDF document text
    • https://wikivosunox.weebly.com/uploads/1/3/2/7/132741322/bumipepisotat.pdfIn PDF document text
    • https://rinezafuwokof.weebly.com/uploads/1/3/1/4/131437641/parisibusav-gexijiborowebu-tebinik.pdfIn PDF document text
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/judefenuwewu.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/minabiwa/dupix.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/samsung_galaxy_s8_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/android_studio_setup_in_ubuntu.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/vw_amarok_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/guidebook_definition_government.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/christmas_medley_free_sheet_music.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_off0000cdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD9 5316 bytes
SHA-256: eff91cbb849688c39bbe6c0e878176bc0df66deb81c3e97fbaf4a66a6044c76c
font_01_sfnt_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 10456 bytes
SHA-256: 2ccb6cc1b5461d9162a6b588aa4eef60edfd83e4054d87a2adefdd4ba1002fa8