Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65b73a313f1fe4b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-25 06:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce8f2b618f6f18948f789abb9d0eab6a SHA-1: 7e0937a0edb383608f3a58fc0b8f8ecdc3f297e9 SHA-256: d65b73a313f1fe4b40470844fd68a85554f5d76a04d7157c118a980f5df0d540
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host a large number of links on disposable domains, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the presence of numerous unknown URLs points towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://apelhijau.com/contents/files/98869829967.pdf In PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/pirufebijos.pdfIn PDF document text
    • http://altus.pl/userfiles/file/worera.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/ramutasosonazeni.pdfIn PDF document text
    • https://laps.pl/userfiles/file/79535099181.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/24585456628.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/zoxivasomololem.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210924142556.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/38002543793.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/76663366753.pdfIn PDF document text
    • http://ch-yang.com/upload/files/79828069521.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/10091289698.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/586a4bf8ce74e58c09c2aef5613c31c2/50147775058.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/49978866788.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/vujoluluw.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/33967920954.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/jumitoroj.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/sititevan.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/xixifefebinose.pdfIn PDF document text
    • https://value.ae/userfiles/file/lisesaporamoxebokijo.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/dixivirepajuba.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/18263418497.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/63853081115.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/vigivipipipupepubuvaw.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/76071993012.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd5e70d3bf---lirifiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ustawienia+internetu+t+mobile+androidPDF 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_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 18284 bytes
SHA-256: dcf2030d80f138cf72f3225d0abb4b3f82ab6e30f1951ce44fb1be6577cf668a
font_02_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 10740 bytes
SHA-256: 4ee4f22ec361fb30f86013aeab7d8ab4791ae7b2637e61dc0c11616c977f95e2