Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdca82e01d9a8175…

MALICIOUS

PDF

71.9 KB Created: 2021-02-24 02:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 76cf7dfa152411f179c005dc12416853 SHA-1: fdb6776effed3b33e748e2b908c07b7f1e07fc76 SHA-256: cdca82e01d9a81759ca6e83f9b3205287b4e58d962108be3365eb70bdb8988ea
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/aws?utm_term=scientific+method+worksheet+elementary PDF link annotation
    • https://cdn.sqhk.co/nokikifabaf/ROdxPDj/when_will_marshalls_near_me_open.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/bhhYcVK/total_conquest_offline_hack_version_download.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/jggj7ig/57084715636.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/iMBggqQ/70787110930.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/ibUKiig/96359176626.pdfIn PDF document text
    • https://bomazadoxu.weebly.com/uploads/1/3/4/4/134474586/tobibexipem-rotagavefuri-saworuj.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/ePhbMPe/34227772042.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/jhgghb8/ancient_egypt_old_kingdom_timeline.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/Ohf9uha/atlanta_detention_center_inmate_search.pdfIn PDF document text
    • https://xadamunakufadi.weebly.com/uploads/1/3/3/9/133986396/57bdc880.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/ravuxudibure/wegezavopi.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/2330481592.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/tavovajulelez.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/reusable_absorbent_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/through_digital_platforms.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_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 5624 bytes
SHA-256: ec0a2dbab7525a411dde240365b2dbdacf8e7aea4727adb4c615233c0d0bdaec
font_01_sfnt_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 11012 bytes
SHA-256: b350bc6e67b8fba69e0ce61cb2e40957c873dc0a0495ced2295b9cf0f7343a72

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