Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec23cf02cad04209…

MALICIOUS

PDF

73.7 KB Created: 2021-02-04 07:00:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8bdb5ea2dccc3776c3e58faa1cbd663b SHA-1: 240bcd2b54693ff564a0582075c385d86bec90e7 SHA-256: ec23cf02cad04209feaa59beca471f46b4130412955acd7381ce34bef61aa4e4
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wb?keyword=metformin%20glumet%20xr%20side%20effects In PDF document text
    • https://livadekawa.weebly.com/uploads/1/3/5/3/135317457/b0f82e6d5.pdfIn PDF document text
    • https://cdn.sqhk.co/bajilevone/jbiaii6/demolition_derby_3_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446379/normal_5ffab08ac07ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_5fd73f913a5a2.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/i2jajbQ/23356130349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465151/normal_5fd61ff301136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427094/normal_600026732ce34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408463/normal_5fe41fda460aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495994/normal_5ffc8f1589644.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/zulezov/zuponerelonedebaf.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/fujugativarogedaf.pdfIn PDF document text
    • http://ritarejameja.epizy.com/apk_bluetooth_for_pc_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/business_english_lesson_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/vozudun.pdfIn PDF document text
    • http://jugikan.epizy.com/jackson_hole_mountain_weather_report.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_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 5204 bytes
SHA-256: ee2185aa5a323ff9c06186b9bf9ca003f95c38c4b921dbb3bbe50b51afd26e18
font_01_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 10816 bytes
SHA-256: 927eedaa376f2282f626903881f6f2e23d27672a7f3346fbd58bb17d98471549

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