Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d70af7315350c1…

MALICIOUS

PDF

41.9 KB Created: 2020-11-08 15:47:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 2e66504b4a546e633ad159699238bc4a SHA-1: e2299c217e8425f85f042c83f7f5f446a3b51d3a SHA-256: f9d70af7315350c1cc909c759dd335fb885ec38b8cf59b9bff46b3de6af2be4c
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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
  • 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://traffking.ru/123?keyword=kitchen+utensils+worksheets+printables In PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/c85c59.pdfIn PDF document text
    • https://fejilezujew.weebly.com/uploads/1/3/4/3/134340931/tovatezetex_mibevukalitew_lipawamejanoxak.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/suxugipipolazog/40001058536.pdfIn PDF document text
    • https://maxekodu.files.wordpress.com/2020/11/salary_guide_2018_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/periodic_table_basics_answer_sheet.pdfIn PDF document text
    • https://sitedok.files.wordpress.com/2020/11/16206979798.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/soxeriwizatewo.pdfIn PDF document text
    • https://s3.amazonaws.com/juzerilem/titans_bills_highlights.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/69538671944.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/towusavobam.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/sepufolirij.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/cheats_for_sift_heads_1.pdfIn PDF document text
    • https://vonunemeruje.files.wordpress.com/2020/11/redebuna.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_off00006159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6159 5288 bytes
SHA-256: 646feb47dd22b9ef1baa5da6913ab0f11984e2a5d9f77a9b07fa2957d9d42fbd
font_01_sfnt_off0000735a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x735A 11608 bytes
SHA-256: 262b3df6c2127fd910790aefb1aab852490dd5851323756ace0f99b93844b14b