Malicious PDF — malware analysis report

Static analysis result for SHA-256 254bf0454b82ec47…

MALICIOUS

PDF

69.5 KB Created: 2021-01-08 11:14:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: db0aacc4c1df8b0afb3f18b65e2b01b9 SHA-1: 4ad014f2041c28ab6d7f20bbaa5ea15b3f4b8d8a SHA-256: 254bf0454b82ec47425644c1c75bd059529b2152b9c4cdad55f2203e4d654c50
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution scheme, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafficel.ru/123?utm_term=solution+concentration+practice+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460063/normal_5fe707ecbb31b.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/bemal.pdfIn PDF document text
    • https://wetusaseri.weebly.com/uploads/1/3/5/2/135297966/pijananopikulegaruj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_5f99831598e82.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/hNhjLxf/space_engineers_dedicated_server_config_file.pdfIn PDF document text
    • https://cdn.sqhk.co/segenoliz/hiKdehd/billie_eilish_hd_wallpaper_for_mobile.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/mawafukutopopomu.pdfIn PDF document text
    • https://cdn.sqhk.co/likamigid/cBPIChg/razixeronawute.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/j6jgNMw/the_lightning_thief_book_series.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/jolozidabi/xuzekogefevujo.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/isaimini_tamil_dubbed_telugu_movies_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/lgbtqiapkah_full_acronym_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/41966331904.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/battlegrounds_mobile_android.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_off0000d322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 5280 bytes
SHA-256: f24828c06dedf9994e6b65b01ab718fc63b100beb73e03305b2829b33cc930d4
font_01_sfnt_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 10508 bytes
SHA-256: f7c70ed6f1d5b047de386e6169b5d25185e62bac9debdb913ebb07c31c5b67f1

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