Malicious PDF — malware analysis report

Static analysis result for SHA-256 d137f0a3b2650273…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 02:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 264f52ae060144cd1740cd5fb9228d3d SHA-1: 6e6a30c56d45b9e5be1161d35ef68ba02228ce18 SHA-256: d137f0a3b26502730cfd1bf4d5aa891a32d7e5a779d2adae227d2b48f0ea6aa0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://albertf.madteam.net/ckfinder/userfiles/files/zijubejanarubujagigud.pdf In PDF document text
    • http://usateatop.com/_upload/files/34894442309.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/limokavudipufevaxirak.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/96233760832.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/jobuwusozanetobamerod.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/gekifitufefosasoginufovi.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210916_7D6DBA7906509D82.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/87122806467.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/dodexeju.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb8dacbc77---99149360654.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/vabaxuzamepudaki.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/25475274555.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/18838722756.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/18376790469.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/kowizidagexigidikubonef.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/57658698892.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/26769885232.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/jonomirorowemus.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/madibajatul.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/xawuzaboruwazopomo.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/61691491642.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/suzuluwasiloser.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/wixixu.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/73448761639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=voice+recorder+pro+apk+downloadPDF link annotation
    • 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://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_off0000bf2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2B 20836 bytes
SHA-256: b38ebc4f0ad3170d61daa147dedaac4a4ed2da03b22113e902e0f79d3790040e
font_01_sfnt_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 10388 bytes
SHA-256: f75869bd9f1e044ae39cbdfffe82120363ab19fba95312086f1bc48c207ca61b
font_02_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1