Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd48e1c61051b5d3…

MALICIOUS

PDF

68.9 KB Created: 2021-01-15 04:37:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b5e0833692ed13162467a25897a9b081 SHA-1: 2afd514cd764b6c0dcb2bc036a60a7280885e6f8 SHA-256: cd48e1c61051b5d33c4f4e56c21541b42261d7757e5177b87b1dbbbe2956ccb0
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://cctraff.ru/aws?utm_term=mission+mangal+song++musicbadshah In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_5f98fce814cbd.pdfIn PDF document text
    • https://site-1249929.mozfiles.com/files/1249929/nakilosamum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469828/normal_5fa355c51dad2.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/Oja8Iig/international_mobile_recharge_online.pdfIn PDF document text
    • https://dowikawi.weebly.com/uploads/1/3/4/7/134741621/2988487.pdfIn PDF document text
    • https:///\/a10.gaanacdn.com\/images\/song\/24\/27962924\/crop_175x175_1565855001.jpg,albumartwork_large:https://\/\/a10.gaanacIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/cape_wide_news_court_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/vuwimesivaju.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/nivewu.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/connection_games_pictures_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/mitsuru_social_link_persona_3.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/apache_camel_transform_component.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/46319374853.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31F 5088 bytes
SHA-256: 618b3589da1c4aa07a6e87a8bbb0e40f124065420b525e3042d3e7d637eb0b98
font_01_sfnt_off0000d42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 10884 bytes
SHA-256: 50813e45209a2ab767fd69e670b37db3fb78d79e49cceb0aaaeec2eaec6828ea
font_02_sfnt_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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