Malicious PDF — malware analysis report

Static analysis result for SHA-256 91feceb3dd024fe3…

MALICIOUS

PDF

50.7 KB Created: 2020-10-02 06:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ed8f044ac7c80a77af0fe956e784ae75 SHA-1: 6b61927d2e6f91d38c056f49dbc8e38bb838a239 SHA-256: 91feceb3dd024fe3d382a98a86d369b8b4eccdcc6e8b08722199055aee05c721
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://gettraff.ru/strik?keyword=world+of+warships+convert+xp In PDF document text
    • http://files.southeasternpaleoamerican.org/uploads/1/3/1/3/131380476/5704910.pdfIn PDF document text
    • http://fujaz.spinnakeugundogs.com/uploads/1/3/0/7/130739653/dexum.pdfIn PDF document text
    • https://site-1036902.mozfiles.com/files/1036902/dofubuli.pdfIn PDF document text
    • https://site-1037022.mozfiles.com/files/1037022/vavodakuwojoboj.pdfIn PDF document text
    • http://fanimokad.tyrarexin.com/uploads/1/3/1/8/131857419/bikenudaliguza-mosuletibanetid-xapoxodulewu-xibusij.pdfIn PDF document text
    • http://jifamoja.calvarydifference.com/uploads/1/3/0/8/130874474/c40fce69a476773.pdfIn PDF document text
    • http://lawonutav.studioeworldwide.com/uploads/1/3/1/4/131406687/favolibav-jaziforilo-witavazital.pdfIn PDF document text
    • http://files.omsairaksha.com/uploads/1/3/1/4/131407135/roxeduxesexu-legexek-dexive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6573/2003/files/blank_bingo_sheets_printable_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/hot_hot_mail.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5646/3015/files/62867857455.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/1873/0902/files/craigslist_sites_ohio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6977/4750/files/desaxaririrowugi.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_off0000878a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x878A 5476 bytes
SHA-256: 5dea41fe4454d405b26152ce926cda87ad84ca561b3d37df37fe5ba71e485751
font_01_sfnt_off00009a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A45 10652 bytes
SHA-256: 01b66b1f9ae5086f02be62bc14287980c99f952b088d6ceab860fbb6c28459bb