Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5fbeaef6e6d688…

MALICIOUS

PDF

78.9 KB Created: 2021-03-08 17:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a2018728a72a4d2efc5c45b2444e0e9a SHA-1: 82d3f5df78590597c269348bf2a1d81975dacaac SHA-256: de5fbeaef6e6d6885ee12b2e585adbf795654a26c05babe1951c0d7c299bc1fe
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The primary malicious URL observed is https://kuzutuzo.ru/strik, which likely serves as a redirector for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=sony+wega+tv+32+inch+weight PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391302/normal_6016cfaaeaba1.pdfIn PDF document text
    • http://murupewobot.iblogger.org/the_boy_in_the_striped_pajamas_writing_style.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_5fe7067329e21.pdfIn PDF document text
    • http://llloooodddd.space/achyutam_keshavam_sai_damodaram_lyrics_in_kannada5z5x0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500887/normal_5ff97c4da47ca.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/58020536844vjsmv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474475/normal_5fd731f11d7da.pdfIn PDF document text
    • http://opensoda.pro/6456163716222j05.pdfIn PDF document text
    • http://acupofjacob.com/does_taco_bell_have_a_low_sodium_menuq68md.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372960/normal_5feed48b7a3cb.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/baaghi_movie_videoc0jse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452624/normal_5fe1a4c4e0f75.pdfIn PDF document text
    • http://fogozuvonuw.66ghz.com/virigosexiredum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/654e390e-77f5-431f-84fd-e9c1c4290af5/37972464345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/598926dd-fd78-414d-9bd9-6f0f86ae7515/sinixareporozefogata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a51ccc5-75ff-4211-9116-8cc7a1d8beaf/70526987766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/643f5581-4ac4-46e5-910b-8ec2b1993cea/53140096975.pdfIn PDF document text
    • http://valamujunitun.epizy.com/harmonized_code_for_paper_sheet.pdfIn PDF document text
    • http://kabemetuva.rf.gd/shakira_loca_loca_english_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6125b418-3b1b-452f-bcfd-7249d6ecaa86/tamezixe.pdfIn PDF document text
    • http://fazesinu.rf.gd/human_rights_watch_report.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_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 5408 bytes
SHA-256: d0d7fa7921408d52c5cfc0c3d0581a463a81dc6084aeaa01ff8fff9ef65fbca9
font_01_sfnt_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 10880 bytes
SHA-256: f4f36c1313f554f6e228f93e259ec9f5199b781c3c504753e16a9f9eb097e44b

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