Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f8be5e9ed215d5…

MALICIOUS

PDF

70.7 KB Created: 2021-10-02 16:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00f431db1254ce2dd5c0c12aaa86b0d4 SHA-1: e23562f8beed8856d97ecb2368a1a0eb92de958d SHA-256: 74f8be5e9ed215d5f89156ed10fe96319f4158b3c964918ae6527634067e3bf5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://bigbazar.cz/is/images/FCKeditor/File/27095910700.pdf In PDF document text
    • http://king-pro.com/userfiles/files/52248061069.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210925035834.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/juvugavifaxibuver.pdfIn PDF document text
    • https://www.amata.org.uk/ckfinder/userfiles/files/10046538952.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/baxafoda.pdfIn PDF document text
    • http://recrute.fr/files/files/daruxunakexofaxadima.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/41956047362.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/37996405663.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/51653989129.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/77703804633.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/658237105.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/20915846843.pdfIn PDF document text
    • http://zatacorp.com/upload/files/masin.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/34762608535.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/83950174123.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/nonipotegaba.pdfIn PDF document text
    • http://hopkim.vn/upload/files/77859848285.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/tosamasujewika.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/fec8161662cade03217a72da115e3724/77129335326.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/takefesexuzem.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/2113290124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=halloween+coloring+pages+paw+patrolPDF 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_off0000b084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB084 10628 bytes
SHA-256: 64e2db5fbe5f1dd338b780dc17c12d8db42928ed811ebfb28438c0522559cac5
font_01_sfnt_off0000c8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F9 17020 bytes
SHA-256: 015a6a79a2b0af7b55a5ea90fe1864906aa5591c827dc11ddc7a640178ac5909
font_02_sfnt_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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