Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdaa39bd971d9f3f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-14 11:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 08498cb0c28443e0aaf21049324dd82c SHA-1: b03b34c4c513677157b922e05c7d520dda106908 SHA-256: fdaa39bd971d9f3f60cac30eb456e1acc326985808e93be15d88fec06e2d5273
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://jetaime-shop.dvsportbg.com/files/150850628.pdf In PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/99075143009.pdfIn PDF document text
    • https://onecre.com/images/content/files/figarawowaresaravi.pdfIn PDF document text
    • http://ativn.com/upload/file/pifeganopume.pdfIn PDF document text
    • http://scro.ru/pic/file/kemumilumiluxugazukofu.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210914150718.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/5033098812.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/zediwaturupujovunefuraz.pdfIn PDF document text
    • http://tykhchem.com/upload/files/70690872696.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/65653882991.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351a05f27ae---50206999794.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/57351577193.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/mivifuvazonofegilefovat.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16131856f53f1f---radafe.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/likapugobefa.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/kifotofipenapal.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/34777852866.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/31834875265.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/20656344754.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/96069674386.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/82267718260.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613099e216cf2---neluwepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=8th+std+science+digest+pdfPDF 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_off0000d0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F1 16500 bytes
SHA-256: c4c7250a48f1029248f930501947792c37439ab37b35d94bae3efa4f597fa23c
font_01_sfnt_off0000fbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 10584 bytes
SHA-256: c0524b9e968c52d55aa214fa17aac90e50c2fa352c12126cc3b8d368a6a5ef67

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