Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b52a367b635b372…

MALICIOUS

PDF

85.9 KB Created: 2021-03-24 09:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 08d9ad51218ef8251c7f05dc55efe954 SHA-1: 576a86f2b160a8d17fa305767050a136fd57a0f0 SHA-256: 3b52a367b635b37243bdbf8c69071c844e13bd9b92ab286f00e53f484450fdf1
186 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 0.9997

Heuristics 6

  • 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.
  • 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://xezojetit.ru/strik?utm_term=outer+worlds+where+is+zora PDF link annotation
    • https://nowesepi.weebly.com/uploads/1/3/1/1/131164229/3284016.pdfIn PDF document text
    • https://mijevofere.weebly.com/uploads/1/3/1/6/131606011/lajepufazogipal.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/tonuvo.pdfIn PDF document text
    • http://ladyso.ru/nenolokuj2s0n1.pdfIn PDF document text
    • http://bottlechainworld.com/sozuzewizosonamudivitotbm9wq.pdfIn PDF document text
    • http://servicesforsupport.com/new_england_patriots_newsycsx8.pdfIn PDF document text
    • https://jupoxoguji.weebly.com/uploads/1/3/4/0/134097256/xolirinefu.pdfIn PDF document text
    • http://titanof-filtr.ru/dulegugodilimelopobetnm10j.pdfIn PDF document text
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/sokusatutedilu.pdfIn PDF document text
    • http://mexicotop.xyz/mathematical_statistics_with_applications_in_r476lv.pdfIn PDF document text
    • https://dujemezore.weebly.com/uploads/1/3/1/3/131381607/dcffef299e8b35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jotozig.rf.gd/learn_hindu_astrology_easily.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f815f2-0c0d-4215-9d94-54a90f889634/sniper_captain_phillips.pdfIn PDF document text
    • http://goxobiwab.rf.gd/bhaiyyaji_superhit_full_movie_filmywap_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a5e000-daaf-4e6f-8f1d-aef556297016/reflection_paper_on_research_project.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 5084 bytes
SHA-256: dc5b0380f3c920303e31b3f12e0b5c5270f3415ce76a1e4d99209ba2789b0825
font_01_sfnt_off00010e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 11100 bytes
SHA-256: f24d05dbf0185dfc0ac12173a8e84b9193db301dfc36153a921ce045f8ad5a90
font_02_sfnt_off00013433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13433 16396 bytes
SHA-256: a629c06848bbb8f5fa091e09d586c13d4a0abd6612e644049e3554c97548a24c

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