Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df33f195b34de4d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 10:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 13ba6652c2cf0fa3e43ef382598ad88a SHA-1: c059dd24b73f46b0d06f7af8b4b106acf01c9b7c SHA-256: 2df33f195b34de4dd41de666dbf02d57ecc5f8c254beacc1e9b909a10d9ac44a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, likely to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studiecarriere.it/uploads/file/98529662240.pdf In PDF document text
    • http://nato-denkmal.de/uploads/file/85833162384.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/nidino.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/wowizexesexuzisekiwosipo.pdfIn PDF document text
    • http://gr-chem.com/upload/files/48044108286.pdfIn PDF document text
    • http://minhanh.com/files/kopofitikipimoxozelasimi.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/7099852509.pdfIn PDF document text
    • https://dellrein.ru/content/file/77880233556.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/fuwujifubagalakamegoneg.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/21261686952.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///48786909085.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/wufipewipux.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e8909beb6---45549915413.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/20445221484.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091307001048.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/54192474275.pdfIn PDF document text
    • http://maxbrio.kr/files/files/3510976888.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/gagapedoxegukurejiperu.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/18978872591.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/37162420693.pdfIn PDF document text
    • https://songhongresort.com/img/files/jisarorevevufogixufaf.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631285808.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/kubavoveka.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/rufososupapupuzofatol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=open+source+chat+app+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_off0000e2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DB 17636 bytes
SHA-256: f2b71363dd705649d4c11d566c46c8332586f49a6fd70a9b8372fa170dc69bcb
font_01_sfnt_off0001109e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B5 10692 bytes
SHA-256: d713e2be14db134e13848c65ad800ec8a9f176ecd78a1a4df944089eaded1f89