Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fadc2edf1e6604…

MALICIOUS

PDF

79.2 KB Created: 2021-10-21 00:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f1e385398d23e9678cd94bcdee6f135c SHA-1: 1d2d8efa1a49511952478a80fe09d1dc251b4d67 SHA-256: a4fadc2edf1e6604d76b598f7a84d30c5e37f3d11bd1187011fac3bb34f6954f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=serial+no+of+internet+download+manager PDF link annotation
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/76mmbejvggh71h9t08nj722tqi/kipaxuligezu.pdfIn PDF document text
    • http://santabruna.cl/upload/file/47329761696.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/tefetixi.pdfIn PDF document text
    • http://cold.lt/userfiles/file/vulivojuxagexelivipukuwo.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/lixesulaxefupulezogo.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/jelifarurazulunexeju.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/setemeso.pdfIn PDF document text
    • http://jcsh.bluezp.com/ckfinder/userfiles/files/pakujumogim.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/3983789512.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/55542613247.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/xuvopota.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab84915fc00583c5d8d52c3ac3e1c437/21415590040.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/99483441089.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/gixodedidoseni.pdfIn PDF document text
    • https://slide-bearing.com/d/files/gakoxejiwoper.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/94085770086.pdfIn PDF document text
    • https://jfava.gemwareserp.com/userfiles/file/gujopunafamepu.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/fugotuxibuseworifagutek.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/41522070820.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/wejeperiwejurudari.pdfIn PDF document text
    • http://bienbao.org/uploads/files/99398817735.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/38395187732.pdfIn PDF document text
    • http://usmleworkout.com/files/file/mebonesopimeb.pdfIn PDF document text
    • 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_off0000d1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 17224 bytes
SHA-256: e55d5548be4e0358eb7d4ce775c5c2070a44cab6f93b8ef11989cd9fd2a7a9ba
font_02_sfnt_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 10692 bytes
SHA-256: b784a56eeda36d6f2b3969584444ffd52436ddd02404b37b38964bd39c4ba980