Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa63dd95bc74b072…

MALICIOUS

PDF

66.9 KB Created: 2021-02-23 00:13:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: d12b5a78cbfe4282a89d554d1ae1ecdf SHA-1: 09e28cb21599965057817f4f70c634335c4b8817 SHA-256: aa63dd95bc74b0723b512de2a9eaadbc20455d13e9eee001e0a12535310cd18c
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=krups+optisteam+plus+rice+instructions In PDF document text
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/b336814856d64.pdfIn PDF document text
    • https://tutonaxubetu.weebly.com/uploads/1/3/5/2/135296536/646a846e5b0.pdfIn PDF document text
    • https://cdn.sqhk.co/besiwowegin/wxhcMib/all_about_history_book_of_ancient_egypt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450345/normal_6029b3d34e69a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_6023fb7a9e419.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381347/normal_5fe45c7420d86.pdfIn PDF document text
    • https://cdn.sqhk.co/fufitefan/ijghijf/66170709202.pdfIn PDF document text
    • https://cdn.sqhk.co/bepifopid/hjjbhjy/diamond_diaries_saga_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459170/normal_5fd165a041a3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485318/normal_6030615462629.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/jdihOig/41654020022.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506063/normal_5ff5fed0e9164.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385207/normal_5ff4b3dfcc7be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sefakazoporemad.rf.gd/52816842841.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_off0000ca63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA63 5048 bytes
SHA-256: 409cbbbbb80357d618670848904097bbe0c30b098ad268808f6c4ba584b7e1ba
font_01_sfnt_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 10312 bytes
SHA-256: cd41f8f2e1b8cd4e61f2bbd70e556d88b4153e57a90f57cb64b0b4fd36a7ebed

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