Malicious PDF — malware analysis report

Static analysis result for SHA-256 7624fee58e00d381…

MALICIOUS

PDF

70.4 KB Created: 2021-09-12 09:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 397f35439d51e728f8d12670be2cd00f SHA-1: fdffe396dfb0c73abc7b1281fc9ea7e0e7df182d SHA-256: 7624fee58e00d381034b354fbc11d220684d9f3c43c0c1e94ce5750c7aee4884
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or low-reputation, consistent with a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users into clicking malicious links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/790508996.pdf In PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/98972186890.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/xikozerinogedebedex.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64823223712.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161387d0185aaa---karig.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210908060808074759y8kojy.pdfIn PDF document text
    • http://klpa.net/userData/board/file/53564593230.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/68261110251.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/31570754328.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/84431722694.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/zuxozisinopumar.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/dupapive.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/17032690185.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-08/894adf49b024e24fe1249b3bd23247bf.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/39662434218.pdfIn PDF document text
    • http://agilesolutions.in/uploads/36393985700.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/sofobevanijupe.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/rejaxojuvapipigutemaxo.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7fd0283b5---34776930472.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/kigewubidigejilasakod.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/xegamudizixujisufi.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/52969491339.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/rebifovagewa.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210901_AE50AAAACD220087.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/tamoxakokixit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+upload+image+to+server+http+postPDF 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_off0000b32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB41 10984 bytes
SHA-256: 82ec34ab5589613259aa7e5696d332802cb61fe6e761aceb76e4b5fd6ce68408
font_02_sfnt_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 15640 bytes
SHA-256: 773b2fcac13c7d321b03ec32ae19b2984829d1e3e0f797c661ff75e6c6c6b4a7