Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7a3d5d31d6126a…

MALICIOUS

PDF

72.2 KB Created: 2021-09-17 16:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbcdcd86028ebfd5839357c0e0c39b91 SHA-1: c157d01ff95ada2b10906301be0d4bde0e95508e SHA-256: 1a7a3d5d31d6126a7efdd7ec2d68355cfef243f17df2ae25eaa1eda4c73ab5f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high density of embedded URLs pointing to various domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing attacks. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=kattu+tharattum+mp3+song+download
    • http://abwessex.com/uploads/files/72419909622.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/futozakutu.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/fuwevekewofod.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c391b7f0a106c8df25f6a4c69653662/siwabof.pdf
    • http://123podkrovie.sk/editor_uploads/files/57643251577.pdf
    • https://abisspaandboutique.com/nbloom/fckuploads/file/37588445022.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613135b0a2ba4---suvevudotapodamaxovusaru.pdf
    • https://lean-ds.com/upload/editor/file/dijofu.pdf
    • https://totalsewa.com/userfiles/file/50900717673.pdf
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/97769976947.pdf
    • http://invismortgagebroker.com/images/file/28395446189.pdf
    • https://ud-hobby.com/images/Upload/file/84266160473.pdf
    • http://web5gstore.com/Files/files/rawagelawuz.pdf
    • http://zavalinka.by/var/upload/file/83106055199.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33446075434.pdf
    • http://capthepcongtrinh.com/uploads/news/files/48194686916.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/78588587875.pdf
    • https://inmaabiladi.com/userfiles/files/sokim.pdf
    • http://botaierpharm.com/upload/files/zapas.pdf
    • http://deepakbatteries.com/uploads/file/26467280272.pdf
    • http://studiodelcorso.eu/userfiles/files/madurivudomoxaxaketas.pdf
    • http://noithatphathuy.com/Images_upload/files/95954869576.pdf
    • https://pakianco.ir/data/image/uploads/news/files/xatewon.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b702.bin
3a2d9a6912291d8f5b20852e208b5632dfe858b3fdd65a72466213a983d0fbd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB702 10964 bytes
font_01_sfnt_off0000d02b.bin
ffbf0731154e241b60c9d53f72647ddc1a390b5bc3d80812655d02e138c33d72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD02B 16800 bytes
font_02_sfnt_off0000fb40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 16792 bytes

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