Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95ba1a1c4038d04…

MALICIOUS

PDF

84.1 KB Created: 2021-09-21 01:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f103eac3912bfb3cc14b60bc3eb7369 SHA-1: 86fb702845f927dcf602fadcc7f3755c99d371e9 SHA-256: b95ba1a1c4038d04be734a95174b5339f53ac21f0602a53504ec097454bb44c6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier assigned a high probability of maliciousness. The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Numerous unknown URLs were extracted, suggesting a potential link farm or distribution network for further payloads. The presence of embedded JavaScript points to an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://onelove.cz/file/57795568566.pdf In PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/94860750782.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/43762909385.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/lajiburagiwejilojopegaz.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/sotiselalupokiravu.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/luxugonarifibunulerumek.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/japoxonomikijomozafefaj.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090321340539.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/feraxozawaxuxeg.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/23297173554.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/lesur.pdfIn PDF document text
    • http://meskerjager.nl/media/files/85260835027.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/77742311380.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/dadigubozevub.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/parosejapos.pdfIn PDF document text
    • https://tavio.ru/files/file/91487923529.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/59280231821.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/25874391138.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/tipiti.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/nebokodewobifenogukonefeb.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/dosogamazivob.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/jifubuged.pdfIn PDF document text
    • http://muszempilla.com/files/file/totajuti.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354ed2a4b03---zipibumukefememis.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/5939365114.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/popabekadikejuzewekafix.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/gujizotadumamefiwegoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+free+video+recorder+app+for+androidPDF 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_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 10688 bytes
SHA-256: ac1d1cb86b9ed0acd6a4123752f74b3fcd521f70362c0ef6b3e1b95869c04faa
font_01_sfnt_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001147a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147A 17512 bytes
SHA-256: a493bcdfe64808fcb8dd7fa32a8c6e286e49e8059da4249c0fc387dc85ceabfb