Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4d4d1728ea965a…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 09:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2fd06521cd4964867ee3e1f7ceca4d2 SHA-1: 616d8ba97f75332d46cdd77afc112ec824ecd792 SHA-256: ba4d4d1728ea965a420a10ef6d34b80a0eadbcdfcbc9fa3ec7190cd47e9458cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to potentially malicious domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing/malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://freeski.hu/freeski/file/fanefukotozi.pdf In PDF document text
    • http://yao-cheng.com/uploadfiles/20210906080027.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7b6ohqv4vt45g1eclimjjoqf96/betekisonumodejepo.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/padaporizasigejiwi.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/fusitugopalopapibadu.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/68396562218.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f92a8e55c---89491838284.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/tufexatukegisukimoxudude.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/pulifulomovo.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/situtivegopijibu.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/ludoroparibebobolibo.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/87624227452.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/87680757731.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/woneweluwet.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/tixas.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/bumikeva.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/12/60819155544.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/12258512958.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/36170696984.pdfIn PDF document text
    • https://banghenails.com/upload/file/gekonu.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/wafunavawunaxuninezirip.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/2973857970.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/21232349345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=super+mario+3d+world+download+pc+cemuPDF 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_off0000c506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC506 10840 bytes
SHA-256: 78617247cbe34d9a9d104e779fa02d9e7321c8c53db69068963fea353b92ba41
font_01_sfnt_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 17588 bytes
SHA-256: 82c5c50d25053e13d3a2f82258c265adea519d0137c9082f35d2b3b809a2a5f6
font_02_sfnt_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1