Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb51a6d5703fd3fb…

MALICIOUS

PDF

84.0 KB Created: 2021-03-09 18:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 367ad1b7779c868346f09271c25fd4fe SHA-1: 51794faa3019ec7cfea58baf45ed736eeb1b03f4 SHA-256: eb51a6d5703fd3fbc1ca491c1600b14bbfa6c2da40e61e7538e423904ed2218d
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 0.9995

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://dugedepap.ru/award?keyword=cape+sociology+syllabus+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485296/normal_6009d9ba175fc.pdfIn PDF document text
    • https://cdn.sqhk.co/dosazuleg/gPcwKJn/baldi_birthday_bash_code.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/haRgd9S/83778442395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459788/normal_6026267f161df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474727/normal_5fe108ebdd8b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_8c7fa1f213e14addafa099ce953d6028.pdf?index=trueIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_bac56d12e63f4ef292ac2b96d43d3e38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/sufejofo.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/nibuwivosabasibilija.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/concussion_management_guidelines_canada.pdfIn PDF document text
    • http://bukogog.epizy.com/56874597369.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/how_to_be_an_excellent_operations_manager.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/muxirorini.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_3ff06d9fd9dc474aa6db5c69b6318658.pdf?index=trueIn PDF document text
    • http://zuwemanikipe.rf.gd/how_to_enable_ecg_on_apple_watch_3.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/abcd_telugu_movie_video_songs_mp4.pdfIn PDF document text
    • http://desiwafinu.epizy.com/life_is_beautiful_movie_songs_naa.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/adobe_acrobat_dc_pro_2017_free.pdfIn PDF document text
    • http://fetevatakipip.epizy.com/43767472722.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/star_wars_picture_quiz_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/10_day_weather_report_dayton_ohio.pdfIn PDF document text
    • http://jukijofefo.epizy.com/lifezeredifuponotetepob.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_off00010c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 5648 bytes
SHA-256: 1244a733a95266a7e82932f556e21bfc9defd3d07a9d015dbf008385db03c11f
font_01_sfnt_off00011f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8D 10244 bytes
SHA-256: be2b8656fcf735841d87489c9ed38e8ff2c043740a8382cfd148e6e63dc6bad4

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