Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35b8c1cc05ca543…

MALICIOUS

PDF

68.5 KB Created: 2021-09-29 06:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f0022928a66e1623e4f02354dc47e182 SHA-1: 3957c92daec2978338dd71ee2ba5ac76017b133a SHA-256: e35b8c1cc05ca543ffb8269e6f59cd33cb676900b5c67c9589ac0283adbb9c2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external sites, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to link to many disposable domains. No scripts were extracted, but the overall structure and URL distribution point towards a common phishing or malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://linza-market.ru/upload/files/wodoso.pdf In PDF document text
    • https://camphacement.vn/upload/files/bamanub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aae3ae1a6---66411153781.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/gijotonumaseponepo.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/27207696323.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/janam.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/71730589808.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/sedonedux.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/ludiroruxigonufugitawaso.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/25919377212.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/kumakupi.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/gonaxexomufaweleb.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/nusafetubaramepene.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/2629b6a50ae184b19692d27299959c0e.pdfIn PDF document text
    • http://apicn.net/upload/files/35425374479.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/lepafajosane.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/metokiz.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/buruxu.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/59585842653.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/pibedolitonutu.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/gukopamozapabomedu.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rinaxatusadujetalu.pdfIn PDF document text
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/12297621148.pdfIn PDF document text
    • http://rsst77.ru/upload/files/zikirokabopamun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=m3u8+to+mp4+converter+apkPDF 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_off0000aeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CB 14728 bytes
SHA-256: e7f084439b9586672799a94ddf00df23f6ef4a9ea08d30e4b278ed0ea9e95bd9
font_02_sfnt_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 10940 bytes
SHA-256: 79b559eccb1329c162491f5834a00262b485e541ed16edf1f32ba5e4a62cfe73