Malicious PDF — malware analysis report

Static analysis result for SHA-256 053086c5dc9abfb0…

MALICIOUS

PDF

107.5 KB Created: 2021-04-09 01:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f6d10c99ced1bc414dc14401407f1bee SHA-1: 15186e591ea2be55a6d73aa6e44dcf96491de924 SHA-256: 053086c5dc9abfb0545053c36ee3ecdc163921a5b57ec9f4599240989135320a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. The primary malicious URL identified is https://mezovuduw.ru/strik, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/strik?utm_term=samsung+un55js7000fxza+parts PDF link annotation
    • http://mapotilij.mygamesonline.org/keluritezaninuva.pdfIn PDF document text
    • https://kilixezexixoz.weebly.com/uploads/1/3/1/1/131163494/5381433.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/jhbHheq/50892682427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476142/normal_60296c1a4e675.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/Wahjij1/78947206989.pdfIn PDF document text
    • https://cdn.sqhk.co/kotoweraga/Evvhjjw/violin_duet_sheet_music_classical.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/ie7zThg/kixapugupaveseredikogis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413458/normal_5fc696b35db46.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/xSghoQ3/waxul.pdfIn PDF document text
    • https://cdn.sqhk.co/miburixegapu/5givgj7/gezujoparotazipomuta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5fcf99cc26caf.pdfIn PDF document text
    • https://vitudanowule.weebly.com/uploads/1/3/5/3/135341415/rudamisuvojidiz.pdfIn PDF document text
    • https://nizosanaradeke.weebly.com/uploads/1/3/4/8/134856136/f364dd1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482849/normal_5fc76d611eb28.pdfIn PDF document text
    • https://kiwogoro.weebly.com/uploads/1/3/4/6/134635848/756d1.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/jTHrUjb/55734896331.pdfIn PDF document text
    • http://kinerexasuxemo.getenjoyment.net/website_zu_chrome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450517/normal_6040355508190.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4ceac43d-3374-4736-8926-b47930641487.filesusr.com/ugd/3b1191_6dd37bfce07f40908edbb9293e1c3560.pdf?index=trueIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_6a2740735f814504a54e1b560e97e509.pdf?index=trueIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_a6f6ecd19e364aaca6f47bde9ef182ed.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14412 5436 bytes
SHA-256: 37b73daa828bd7b384fd5f63a10e1c4ceb4cbd73bf5bc93b6b9e185baa90e2bd
font_01_sfnt_off00015688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15688 11000 bytes
SHA-256: 545bbd0f271a1a38bda0f02976a300d2f7817898c189dda108494449fe18118c
font_02_sfnt_off00017c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C30 16312 bytes
SHA-256: 581915cc0c035b77c1b7c2777237d1bc8c3062919f39325f9e93908c35dd23e8
font_03_sfnt_off000191e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191E8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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