Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8b5ce3f42ab7d6…

MALICIOUS

PDF

83.4 KB Created: 2020-11-13 09:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: df93b745f363b75ebbaa5f7dd6906bef SHA-1: df18858f05ebbb38f0db0bdda17acd460d2e9736 SHA-256: 1c8b5ce3f42ab7d62d12ad0a02592e1ef0b5fe83c2df27b54540ec7bcd7cf267
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffking.ru/aws?utm_term=chasing+cars+piano+easy+sheet+music PDF link annotation
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/lubekozikovi-lifabupa-vilulogusid.pdfIn PDF document text
    • https://xemojunaxumig.weebly.com/uploads/1/3/4/2/134265853/xodopexokogef-zeziko-suvubude.pdfIn PDF document text
    • https://siravexadobema.weebly.com/uploads/1/3/4/3/134320718/7119237.pdfIn PDF document text
    • https://fixasamajiwige.weebly.com/uploads/1/3/4/3/134318971/26080.pdfIn PDF document text
    • https://wavigijaburejuw.weebly.com/uploads/1/3/4/5/134588531/nogerolapewelut_poliwoku_xidakobo_pugibomesizafom.pdfIn PDF document text
    • https://mawanegofarate.weebly.com/uploads/1/3/4/4/134466522/456112.pdfIn 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://uploads.strikinglycdn.com/files/90924acf-5591-4cde-81a1-8e5342c5a60b/xetudejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb16072a-b233-4ed3-9d55-82eec2a4ae9e/clash_of_clans_town_hall_5_base.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d327112e-d628-4a43-a5fb-7b32399a24b0/hacked_snapchat_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bcac567-0dee-40d4-b842-a6a2c4603e19/warupemapalule.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 5324 bytes
SHA-256: d70f4dc591ab69d40d3d4616a1bcec38997c3b6cfdec022acadd90c85ad885db
font_01_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 11124 bytes
SHA-256: aba0d1ccb2cbae0915c22bf228c11ecdc70175e4db92b004ac46beae89ffbbc0
font_02_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 16100 bytes
SHA-256: 84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52
font_03_sfnt_off00013273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13273 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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