Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd30a968ce533660…

MALICIOUS

PDF

83.1 KB Created: 2021-10-10 04:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c5985325f64a8a62dbf255fb9ce7ec6 SHA-1: ffb2f65ec807ce00d8841e5a4c9cd8e202987c03 SHA-256: dd30a968ce5336608de549a68a76c59ddce4a56bab4143c9fe372efd660af525
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of urgency lures further supports this, as it's a common tactic to prompt immediate user interaction with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/uplcv?utm_term=disney+questions+and+answers+quiz PDF link annotation
    • http://tochalco.com/uploads/files/97473434807.pdfIn PDF document text
    • http://www.siposferenc.hu/html/30801676761.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/50339668109.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1615d5c5b1d34c---36308848112.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/kupizeseguzazaleb.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/50315310711.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/37230406963.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/53012249269.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/zebotikarukedumigifejumo.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/dalipulujenepafo.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/kedajufugirapif.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lubegulaxoli.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/wewowegumipufokabo.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/rokaxima.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/gujosoxafemedaju.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/43655981868.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/22529169862.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/47758445656.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/toxoxigajo.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/74881052894.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/75741908876.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_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 10700 bytes
SHA-256: 8e5693032d6a54b939a9c91ede4a98fac9aac1278bf681e5395f56840b8af74e
font_01_sfnt_off0000f7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 18152 bytes
SHA-256: db49e47406f4cd23067c2f038c6e295f44c036bcd007f848a5af2bc7b04e9e7c
font_02_sfnt_off00012705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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