Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe35d91bab00ceb…

MALICIOUS

PDF

67.2 KB Created: 2020-12-24 01:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5d629d7d2f33585d8e56d50cd9885482 SHA-1: eb8c6abd6461a379a5dc43edd275bda51363a552 SHA-256: 3fe35d91bab00ceb0bc086cb28c26d6ea6c139aa671855379abefa9b30794b98
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lead users to potentially harmful content, possibly involving phishing or malware distribution.

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/123?utm_term=what%2527s+the+pic+smarty+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403131/normal_5fc6f982c91de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_5f94814a2f6ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404502/normal_5fdcfe6d25273.pdfIn PDF document text
    • https://cdn.sqhk.co/wotezowedo/0ZX28je/my_singing_monsters_figures_series_2.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvapipitol/EUhfghY/dekedenogibibapemovari.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/fuseni.pdfIn PDF document text
    • https://wudonazig.weebly.com/uploads/1/3/4/6/134675044/5792aa2498.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/Zb2gjAW/74648923888.pdfIn PDF document text
    • https://cdn.sqhk.co/lepitajirel/chg4ggU/cruise_line_jobs.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://s3.amazonaws.com/gopuze/animal_kingdom_tnt_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/vitugeresusab.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/svr_video_recorder_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/20395239496.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_off0000bab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB2 5060 bytes
SHA-256: b10a75437e61efbf4daf862bc9acad84ee1cc85e1946003ea49cd40f39bb5bf7
font_01_sfnt_off0000cbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD5 11224 bytes
SHA-256: 9eba69132644864179d3efc2705e2ffd667c8fe66902b95740dadb686b28aeb8
font_02_sfnt_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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