Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1d013c5ba70bc0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 00:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53a09c33ab5e92dc2a332feb482dad93 SHA-1: 38eb91ee9441799f2fdd6d4e9a6dda0f0d9aee6b SHA-256: 2a1d013c5ba70bc0d0e20ec9041c3801b75adaf85d314c9df0a2eb08bc1317e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains to obscure the true destination. While no scripts were extracted, the overall structure and detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/232465d0841bf6c8b8d3b6dc714aec8d/xuvalirowenuw.pdf In PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/32644050898.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/rogobajawudexetinofifijop.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/gogofakevas.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137551f79646---6450787231.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/vopoluporosuzexaw.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/49155251317.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/tolefeveferuretoxiz.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/89679840509.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/riwomutenopurifilisuro.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/piroxojevugosutudiko.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/95815569693.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/fikuzumelobunik.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/45122980653.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/rogeveponatekapozanoguku.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/73372251614.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/18573240365.pdfIn PDF document text
    • http://mobitransjogja.com/files/negiwunaxawimamid.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/pezebuvekuniwuvobobodoton.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/53197495864.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/nuvusozigamixitotafat.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/31909002168.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/xaxirexugoveliwatebopev.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/vuvowesizodiwanixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=frp+bypass+toolPDF 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_off0000dd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 10148 bytes
SHA-256: be77db48ce0e3e39808a9a1bec4976f645b7593da0294851144dd68b300b3515
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 18476 bytes
SHA-256: f76745930cb52f9efb6900e51d87da719a4e95e4c9bf9a03866936ccccdd2530