Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e994fe77179850d…

MALICIOUS

PDF

81.4 KB Created: 2021-03-28 17:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 405ccf6b4fe3eac74a4e32efdf6d73d5 SHA-1: c377900eade965e355a5095b944f5b7feb2c69b1 SHA-256: 5e994fe77179850de7af394bed290b642ea9b3b9cca451fd0ef60404e684aea3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://seumenha.ru/strik?utm_term=mini+dv+tape+to+digital+converter PDF link annotation
    • https://cdn.sqhk.co/vawupemowa/jfhi8mv/world_hockey_championship_2019_standings.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/bright_line_eating_vegetarian_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/ejeSRWD/91039156608.pdfIn PDF document text
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/7681345.pdfIn PDF document text
    • https://gokuxevi.weebly.com/uploads/1/3/4/0/134017514/5621540.pdfIn PDF document text
    • https://jeluvuxibobuna.weebly.com/uploads/1/3/4/0/134017570/divigedimogavutumigo.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/spelljammer_ships_5e.pdfIn PDF document text
    • http://dazenad.iblogger.org/ventricular_arrhythmias_esc_guidelines.pdfIn PDF document text
    • https://wakuwuwosabi.weebly.com/uploads/1/3/0/7/130776519/wikidugaw_xomemago.pdfIn PDF document text
    • http://gemotebefid.22web.org/lusonofam.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/42498458029.pdfIn PDF document text
    • http://galufixagomedo.getenjoyment.net/groot_bestand_kleiner_maken.pdfIn PDF document text
    • https://zodemabu.weebly.com/uploads/1/3/4/8/134896511/datojiw.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/hhThaja/natijunimop.pdfIn PDF document text
    • https://tarofojazen.weebly.com/uploads/1/3/4/2/134235484/2171302.pdfIn PDF document text
    • https://zutuvibob.weebly.com/uploads/1/3/1/4/131407898/2086899e874.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/icnhdhF/blood_pressure_medications_names.pdfIn PDF document text
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/f7b9773e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_b72d8602fb154995a79b02e69b3da486.pdf?index=trueIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_bdfb45ac567f48f7a2f0549ddfc15847.pdf?index=trueIn PDF document text
    • http://besasasef.rf.gd/wowebizevule.pdfIn PDF document text
    • https://d2d110b1-dce0-4b0c-bed7-be24280b7a6e.filesusr.com/ugd/165585_28049941403e4a56814794c564ce55ac.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_0935ee18f94f4644b8695b096269b85b.pdf?index=trueIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_eba38c532d0b45b1a7400d1d272b70f9.pdf?index=trueIn PDF document text
    • http://rizizevifixelu.epizy.com/nizobowijubenoloxorob.pdfIn PDF document text
    • http://ferodibev.onlinewebshop.net/definite_article_the_rules.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_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 5128 bytes
SHA-256: 0ed05737ea03a8017500a0e95aa7e62a4e44ae8bd876ead0da78c11150075848
font_01_sfnt_off00010ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE8 12072 bytes
SHA-256: c9a21b9853dff462a5c37351aaa0397db333d8a22db0f78453da58a75f58f69e