Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2176b564522c94…

MALICIOUS

PDF

74.2 KB Created: 2021-09-14 05:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 14b65b42a6c661f698a97e873a9e930d SHA-1: 93627923bcf3310fc7c91a755342681301e48838 SHA-256: 0a2176b564522c94a38c0029019ce8340b9ec2643bb93ec89113b74da591dc72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection signatures point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf135a463---665805171.pdf In PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/ditepakitufazasola.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f0ccad56f---77168142221.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/ramasipememotafi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6aa33c8a3---tinaduluze.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/vunuza.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/tekosoxinisexovusam.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/79741540507.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/15520784049.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/30776710892.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/42895774491.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/rukokexaxabudepimapozege.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210907131947_692eej.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/rudezaruminiwa.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/mugenadapepobu.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/99123553213.pdfIn PDF document text
    • http://npas.ru/pic/file/varajanarekomuzuzabudu.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/kanavisabenezonajelonufow.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/sabanavoso.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/vanowake.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/zujekuno.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/sowotiguzi.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/ruwemilinibuduzazinaruvod.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/71595475031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+tv+izleme+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_off0000b893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB893 10584 bytes
SHA-256: 8d35a2f924ed823aa0022008bb50be7c93dd396c5817df1b1c9d4a2460f90c77
font_01_sfnt_off0000d0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B7 18900 bytes
SHA-256: 0934fbe621046f4a13ad2289aea9cb17e721dead54eca65c6478d5045b08fef8
font_02_sfnt_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1