Malicious PDF — malware analysis report

Static analysis result for SHA-256 335d16fd2b781733…

MALICIOUS

PDF

76.6 KB Created: 2020-12-02 07:07:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a15ebdb9fbd8c2a83553f6351b8d6479 SHA-1: 157532a2279761d399c85ae1ac3793450aa752fa SHA-256: 335d16fd2b7817337e8873e46d9203fcb7bb22f008ac05bd9b730d8b1f1b2b52
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 0.9998

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://trafffi.ru/strik?utm_term=btd6+mod+apk+10.1 PDF link annotation
    • https://xomadugazulu.weebly.com/uploads/1/3/4/5/134597447/8dcb664be53068.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/pudiwobeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_5f8abc0e4d48b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5fb2d4a9a01db.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/begijufadi/saber_conjugation_past.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf90a9d104e5f152d7cb6/1606220055564/tv_tropes_terminator_sarah_connor_chronicles.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/boogie_woogie_blues_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/aaru_film_song_masstamilan.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3624192c50b1a1e875bab/t/5fc6adfde6d49a06bb7fdd60/1606856192847/81927279720.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdfa9e2dd96f5918b42619/1606285982881/nukizumotejiwunuri.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/boomilever_science_olympiad_designs.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/sixekifulojidebij.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc599cf5e8e827d42add72c/t/5fc6d44befc65c5b7a303465/1606865996215/learn_html_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84699e4d-f2b7-4ddb-a5cb-42b64bc059f3/9913297952.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1480d27a199023ab7f389/t/5fc36af7a97599144e638b1f/1606642426629/sosugikejo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 5292 bytes
SHA-256: 2cb4f55959c4548205127295a5c90eeb661ece2238f6376b5c228b30e40bacea
font_01_sfnt_off0000ea74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 10956 bytes
SHA-256: 3c75b58ff763bc187f123842337e58ff902ee74af5540f17bf5d5b80c3b8ef81
font_02_sfnt_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140

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