Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a653a1b58412aeb…

MALICIOUS

PDF

71.1 KB Created: 2021-02-05 20:04:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 7b413b8ee867b6cead1ab9b5233cf681 SHA-1: 8accb6752a0a7f9c2a20da42526f88f4978bdeea SHA-256: 5a653a1b58412aebdf1671a1d44dcb42719cbbfb6920d6b7f91570a2f59dfb70
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/wb?keyword=cover%20letter%20for%20university%20application%20pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4493266/normal_6000a0e48c0d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447466/normal_5fd63598da368.pdfIn PDF document text
    • http://namelesssouth.xyz/ganazudiwannypp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_60095a9457aa2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452376/normal_6003f4f977752.pdfIn PDF document text
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/9684c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373261/normal_5fee1fb6f30a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428043/normal_5fe936af28cae.pdfIn PDF document text
    • http://devgame.design/fototaledomepopunepuga6sonu.pdfIn PDF document text
    • http://vseti.life/64424818863spp1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460070/normal_5ffabd61c8a0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369495/normal_5fe5c74819a8b.pdfIn PDF document text
    • https://pedogore.weebly.com/uploads/1/3/2/8/132815008/geleralivepi.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/viref.pdfIn PDF document text
    • https://cdn.sqhk.co/rosivapixove/hji44ij/american_country_music_awards_2020_winners.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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 5216 bytes
SHA-256: 5cc3574866e2c84daa3c305cccfbca5a93f198b9cce8be2767a1f27e3cf620c4
font_01_sfnt_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 10012 bytes
SHA-256: abc2a052f4351b50d20ce53bec80ff3e5c0805d68da7b95ff896ae7f34c4cc68