Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c311fd24dcf4f1…

MALICIOUS

PDF

73.1 KB Created: 2021-02-12 12:07:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 5419ceb35395caec43eb5d6d90d5a1fa SHA-1: a1ec855e9bebc95728be0d9ff6a9877c8de92654 SHA-256: f8c311fd24dcf4f1bd83d1f5dc7fa967bfd4970e075d37cfba41819c773d3ff1
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://yafferge.ru/wix?keyword=catholic+churches+in+northern+nj In PDF document text
    • https://static.s123-cdn-static.com/uploads/4366017/normal_6008c305d3f2b.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/Vigie7a/97956004508.pdfIn PDF document text
    • https://rozigakix.weebly.com/uploads/1/3/2/3/132303329/ffb63c0a625.pdfIn PDF document text
    • https://bipinudaw.weebly.com/uploads/1/3/4/7/134718108/rudisorajew.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/ZjiVWsh/fowevuguretuwus.pdfIn PDF document text
    • https://cdn.sqhk.co/jafiwimeg/ijhbigx/shop_bunny_bubbles_song_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/WLY8jg0/turbo_card_balance.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/jGfifMw/69382612194.pdfIn PDF document text
    • https://dexazime.weebly.com/uploads/1/3/1/4/131437554/jasomiwadawekow_nidagise_mimafoju_besiporox.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/jhAozif/suluwetebopelukibo.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/TmjcjaO/41896681677.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380084/normal_5fcc7ef838118.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385207/normal_5fde847d7d081.pdfIn PDF document text
    • https://cdn.sqhk.co/xamizine/hhcdiic/pinon.pdfIn PDF document text
    • https://firulozide.weebly.com/uploads/1/3/0/7/130775295/pujawovososufa-dobetupobozew-doduvagixiti-kanekiluwek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469633/normal_5fd136f70cda6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 4868 bytes
SHA-256: 2106ce47b6dc88f05c2a3a3bddb21f5db61e2e5b90dacafc12f2d10aec93562c
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 10428 bytes
SHA-256: a5591b8960bc6cf6374b69900b13c57a079b2b93f2898e120aeba112f03c125e

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