Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9be894257cf63bc…

MALICIOUS

PDF

68.1 KB Created: 2020-12-20 13:22:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a53a3e54c80f5bc9001bde47499b1e13 SHA-1: 85b352061140cb7b16efeac93e78ae176f864de2 SHA-256: d9be894257cf63bc15b26ffad2504521157b9130213573d09b72ec014f6fd91b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL related to hacking. It also exhibits characteristics of a PDF link farm, with numerous external links, suggesting an attempt to distribute malicious content or engage in SEO abuse. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=offroad+outlaws+hack+pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5fd297252d202.pdfIn PDF document text
    • https://tazifidaron.weebly.com/uploads/1/3/4/9/134901468/nojozuvukifuwuforeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_5fa37a8bd4f76.pdfIn PDF document text
    • https://wosefekolejareb.weebly.com/uploads/1/3/4/3/134340916/2629d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422914/normal_5f97e7b76955a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414341/normal_5fcf6ba80ff42.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/limepusotanal/88497444965.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/62797020686.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/the_story_of_my_life_helen_keller.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/vba_excel_format_cells_bold.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f908ea-6b30-41e5-a1e6-6f2a9a0efa2f/52924874272.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce6f2fe3801a230efcbd57/t/5fd6720d491a58544a13c9a3/1607889423857/arithmetic_and_geometric_sequences_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/capital_investment_analysis_excel_template.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe052b3f75b166439be320/1606288690003/tft_monitors_for_sale_in_nairobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e20696d-6f93-4ba4-bb5a-02c63f7dd557/lenobolate.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_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 5424 bytes
SHA-256: 0c5bda699d8603aa2ddd971817c0bd512e99802fd9629f6111778cdde4972fdb
font_01_sfnt_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 11084 bytes
SHA-256: d44006c97490bbad3b79943e7783ad04dead54e096c90ef1693661135df1d6e0

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