Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c21cf7b5cc8effb…

MALICIOUS

PDF

87.8 KB Created: 2021-03-03 02:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 23a309343988498b6aa951e9ee5eda91 SHA-1: bfb4ea9dea0474d0879c0a8cadada0f5e2536fd5 SHA-256: 4c21cf7b5cc8effb04e7a5a35077006f65925a926646881dda4b5320d311b0a6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead the user to a phishing site or download further malware. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer a malicious redirection attack.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/strik?utm_term=who+built+the+first+reflecting+telescope PDF link annotation
    • http://artrosil.xyz/which_photoshop_is_best_for_beginners2c2ta.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/13027105356.pdfIn PDF document text
    • http://tumbochka.space/free_funeral_service_booklet_templatezkq4r.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/how_do_i_adjust_the_bobbin_tension_on_my_kenmore_sewing_machine.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/jatujoxaxulufi.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/V2jeHm7/baby_bunting_phone_number_australia.pdfIn PDF document text
    • http://socialwave.me/ledatuvanabodjwvvj.pdfIn PDF document text
    • http://dotavulilego.mypressonline.com/32966449854.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/jifIiiO/sixaxunipejefeme.pdfIn PDF document text
    • http://ctyr.ru/black_and_decker_flavour_scenter_steamer_manualz7hic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427300/normal_603e2a8dd1b92.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/lhjMVgd/64988473937.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vexabimumemig.atwebpages.com/chinese_civilization_a_sourcebook_2nd_edition.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A57 5220 bytes
SHA-256: 9b2cb69caf47fcc3e62b97d5ad702815475731ae3faad6199a8fcd8f4e972154
font_01_sfnt_off00012c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2A 11116 bytes
SHA-256: 442f4b61fd4794a7ca613cdd099f6a323539c1f7c6551bbfb00faf03ddc4cc00

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