Malicious PDF — malware analysis report

Static analysis result for SHA-256 32d5810d49213ea3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 00:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 289a10ce3271f238d0701d08800644ab SHA-1: e89f2ec7e0414eae83e02f45af679abf85675835 SHA-256: 32d5810d49213ea380726975fa87afd8d404616d56981f48f890cd44ba8510f4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crysiq.ru/uplcv?utm_term=how+do+u+make+the+color+purple
    • http://ekvatorbl.com/userfiles/file/fupifojonufovigolufubu.pdf
    • https://royal-art.pl/uploads/userfiles/files/6389358563.pdf
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/xefudezonexa.pdf
    • http://worldprint.su/userfiles/file/runewu.pdf
    • https://bocion.com/ckfinder/userfiles/files/48232791667.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a651eb96e---bebovufadoje.pdf
    • http://sinproval.it/userfiles/files/77668331450.pdf
    • http://knshzj.com/CKEdit/upload/files/muxibatabosivuw.pdf
    • http://becucci.it/userfiles/files/15368673076.pdf
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/81527868803.pdf
    • http://pusheng168.com/uploadfiles/20210908152109.pdf
    • http://transcash.com/ci/userfiles/files/70636280003.pdf
    • https://successalpha.team/upload/files/75881463825.pdf
    • https://martabaktelor.com/contents/files/15643163533.pdf
    • http://visusmarble.com/images_upload/files/59507019088.pdf
    • http://gandolfiarchitetti.com/userfiles/files/virebuwuzaminunopenotunir.pdf
    • http://vector-food.pl/userfiles/file/30562535524.pdf
    • http://cf2sc.cn/userfiles/file/satarozepu.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/25966770385.pdf
    • https://krainaogrodow.eu/zdjecia/fck/file/bojojazelolavekitifigi.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_off0000d892.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD892 16792 bytes
font_01_sfnt_off0000f0a4.bin
1193b6e7b170179609ed8d668785af5213e0c78754eb483f213f744df7c73bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 17860 bytes
font_02_sfnt_off00011e90.bin
57b9b66f176bc537c7f118f07ff676930a7529275ac128503c9e131091644207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E90 10684 bytes

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