Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37462ee22e67e72…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 09:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33b9b308d541c2e9c4342bc684bae8a0 SHA-1: 5e2f490942902938701aa776053a4f6098868e2e SHA-256: d37462ee22e67e72f103904383d7e9f8c658cb7d6702a42c075bb0d80c58b512
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URLs, many hosted on disposable domains, suggests a phishing or malware distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely to deliver a trojan or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=h%C6%B0%E1%BB%9Bng+d%E1%BA%ABn+quay+video+m%C3%A0n+h%C3%ACnh+%C4%91i%E1%BB%87n+tho%E1%BA%A1i+android PDF link annotation
    • http://rooptex.com/uploads/95146242912.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/34924791003.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630532107/files/7274927090.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/66849169565.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/buzufamopizekanobojil.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/pobiparugadogabamovog.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///gibufezegivad.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/bukusenodubunaz.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/81498419534.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/3166882620.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/86888328399.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132f01dcba3c---lodidipam.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133c64c93f9a---zubekabetikisu.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/tezamasomizupivijosekife.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/14093958810.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/kesebovipufujebigozipuvu.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/55963260571.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/52998479268.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/8965808392.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/9034682771.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021090111540326280.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/lomodisugibibewadaju.pdfIn PDF document text
    • 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_off0000ceec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 28076 bytes
SHA-256: 67b4f99b8de0b1f9538a9dd99a4ccc9bcbd2104d495ce6596a155cd9b457ae18
font_02_sfnt_off00011e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 12412 bytes
SHA-256: 1850d047b20ad6a893115380a419d3b854cb2e35d48045c748bd4a88057a5a92