Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c7bc799edf752e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 06:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c135d572276131d55ba98eed4f9221f4 SHA-1: 780411ba1f09de99907929062530c02ee0df62a0 SHA-256: f1c7bc799edf752e61d458d2a0bfe88b3667e69efc6f41724b5ef7e3e2e1f490
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving user redirection to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/860589732cf321db329cc0385919f612/67395517803.pdf In PDF document text
    • https://idealist.ro/userfiles/file/zuperojonuzedajofitabuxuw.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pq7b9m8n8k641rmd3a7h1n3g87/57930596088.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/lixudofuzasalak.pdfIn PDF document text
    • http://epplast.com/files/file/26970889134.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/86152922668.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/duxefilawebesepoxas.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/rosamoka.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/25712921946.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/waxenobulijafag.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/fimizoz.pdfIn PDF document text
    • http://sissonne.hu/editor_up/wezakizen.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210912075421_vdi0b0.pdfIn PDF document text
    • http://cx-gl.hu/images/files/39971883105.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/fagefogaxemezejimo.pdfIn PDF document text
    • http://tiquital.com/documentos/file/fonofupirerabudasoxogaj.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/17310898369.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/moxekasowu.pdfIn PDF document text
    • https://cardolf.ro/files/89741081785.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/buwabulenuzojez.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/gaxibovepog.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/laribogarolas.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/rojupum.pdfIn PDF document text
    • https://halead.com/uploadfile/1630847179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=18+wheeler+dreamcastPDF 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_off0000d552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD552 20364 bytes
SHA-256: 411f9a797c9744e603602ca909e99458f3d0fbf9f01eda52f316e623a740bf75
font_01_sfnt_off00010b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 10568 bytes
SHA-256: 01be78a89ad30fc130a8279f61e2cb405c932ab5a6daad15649131bb22d45cb9
font_02_sfnt_off0001237c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.