Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbd731182e64eb0…

MALICIOUS

PDF

75.7 KB Created: 2021-01-23 09:30:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: ddf92045f2cc3e66a2cad7154756d2ca SHA-1: 2ebc097d5bb931b07fa4e1e9870faa6405182f85 SHA-256: 5fbd731182e64eb03666eedf0b379bbf6cf5e6aaf65953f2d8bd199012637ebe
294 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/aws?utm_term=video+editing+app+free In PDF document text
    • https://static.s123-cdn-static.com/uploads/4476421/normal_5fe5d4bca8ed8.pdfIn PDF document text
    • https://cdn.sqhk.co/dakagugi/jf6Ejb7/avtosh_2_charx_android_oyun_club.pdfIn PDF document text
    • https://cdn.sqhk.co/mujutuzidip/Oiaijjh/95499550598.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404984/normal_5fdf318b91755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385862/normal_5fcc95883a9f8.pdfIn PDF document text
    • https://pemilixip.weebly.com/uploads/1/3/5/3/135330450/moteduzuzum_dovomisasini.pdfIn PDF document text
    • https://cdn.sqhk.co/soletibedix/hgzgchf/76556602500.pdfIn PDF document text
    • https://site-1177404.mozfiles.com/files/1177404/74500658225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505839/normal_5fe61995d2c7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492918/normal_6002b0f26a93a.pdfIn PDF document text
    • https://site-1178370.mozfiles.com/files/1178370/tujavojar.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/fowonaxul/14118111172.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/baixar_snaptube_android_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/como_averiguar_un_imei_reportado.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/bodoni_svtytwo_itc_tt_font_free.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_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 4964 bytes
SHA-256: 3923129c677411a5e19e28830ed000449b2e294da2349d766cb4b96c73a30b09
font_01_sfnt_off0000fe0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 10600 bytes
SHA-256: 789bb79a29ea8d49c48dfd764635fcc6b153239faeb21612bd30e3d1b69b3418