Malicious PDF — malware analysis report

Static analysis result for SHA-256 8517cbd7b492eef1…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 02:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36af54a907da2f3b243402179462c534 SHA-1: 2365085572bddf385385c7b600b480778334beba SHA-256: 8517cbd7b492eef112fb1734e24c317bcb6596703e537d3903c9f3b81d220834
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, with at least one identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings strongly suggest a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://laborke.ru/uplcv?utm_term=harry+potter+and+the+sorcerer%27s+stone+full+movie+online+123movies
    • https://birudongker.com/contents/files/xaxiter.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/1292615527.pdf
    • http://hitmet.slektenkaas.com/bilder/file/32628561071.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab04613b45---64417159501.pdf
    • https://horgaszvelem.hu/ckfinder/userfiles/files/40324827975.pdf
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/natunevitimik.pdf
    • http://393citizen.com/upload/files/rotinatozowo.pdf
    • http://sudeoksa.com/userfiles/file/20210906093511.pdf
    • https://pixel.bg/img/file/17140228180.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/23929418199.pdf
    • http://transchem-tech.com/Uploadfiles/files/rewotumasugidisaf.pdf
    • https://kapokcmassage.com/uploads/files/202109100615236604.pdf
    • http://hilimall.ae/uploads/files/velazidunopebuxekowaji.pdf
    • http://taiwanquinoafamily.com/shopadmin/upload/files/biwevujapinizufudef.pdf
    • https://micro-logic.ro/images/uploaded/file/widefe.pdf
    • http://opusbiz.kr/data/editor/file/14933339336135ba10a34e2.pdf
    • http://lycee-elm.com/userfiles/file/fekuxiwireju.pdf
    • http://nissanotogovap.vn/uploads/images/files/7406892803.pdf
    • http://dagmare.de/userfiles/file/suvotugego.pdf
    • https://espritgt.com/userfiles/file/zuzukimumewunevirolob.pdf
    • https://mbamantra.com/ci/userfiles/files/defokisafugedazibigozuwin.pdf
    • http://jiehuist.com/userfiles/files/wuwabezatusawixirakit.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_off0000acd6.bin
cef7646b4c4fcfa210bedf7df549b696c7a5ec9011cdc23907e50e73a3ec7b03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACD6 11532 bytes
font_01_sfnt_off0000c822.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 16792 bytes
font_02_sfnt_off0000e034.bin
6c408cf6fcf501e3d42a38d55de3e0ee975e43f43cbbad26e6f24ea7abffb6dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE034 15516 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.