Malicious PDF — malware analysis report

Static analysis result for SHA-256 728d468225135fb7…

MALICIOUS

PDF

71.4 KB Created: 2021-02-23 06:09:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: bf46ba55ef254159849b48c8a20c2c67 SHA-1: a9d758744e167d2f9eeb76126e50b713687f16af SHA-256: 728d468225135fb7bc7ffc2ac709e21a2c2f3f8f345d980a1fa3225f4bdaca5d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common tactic to lure users to malicious sites.

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://jacksth.ru/wix?keyword=laney+high+school+athletics PDF link annotation
    • http://arendagg.xyz/charles_proxy_3._6._5_freeycvqx.pdfIn PDF document text
    • http://freedate18.xyz/xavekekixowk208o.pdfIn PDF document text
    • https://rugabefek.weebly.com/uploads/1/3/0/7/130775918/mazed_toxokoraxewa.pdfIn PDF document text
    • http://fishland.store/989991056786rjha.pdfIn PDF document text
    • http://fruits-summer.fun/who_made_the_chosen_one_prophecy_in_star_warsmum53.pdfIn PDF document text
    • http://latuha.com/bengali_letter_worksheetxkkz6.pdfIn PDF document text
    • http://yoganchik.space/adairs_fitted_sheet_singlethzh9.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/2lRr3ih/44946996236.pdfIn PDF document text
    • http://znalomstvavip.site/71390957901uvvyo.pdfIn PDF document text
    • http://leomannapov.com/301089464648ct4d.pdfIn PDF document text
    • http://shoop-fr.ru/pre_vocational_skills_worksheetswmsky.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/r1ibghP/sodagupewipizafameraxodu.pdfIn PDF document text
    • http://milky-rp.space/41535791562vfpeh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najorenowodume.epizy.com/84077744219.pdfIn PDF document text
    • http://labapok.rf.gd/45052998045.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_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 5008 bytes
SHA-256: bdafd78d395b8e128fb18b4ae3fef4b9ed7209b7b5fc4aa966ecf976c69695b8
font_01_sfnt_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 11028 bytes
SHA-256: f860499b31f551656ef3cbfe79535d30614759768b4b06bb2a9b25be52532ca7

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