Malicious PDF — malware analysis report

Static analysis result for SHA-256 526bb4fec30483ad…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 08:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37429a16152f54053cab11eb1a5b1e48 SHA-1: a23b389cea3dfa9d63fa0afb805af8a1f2264579 SHA-256: 526bb4fec30483adce0d262c2d478f54d54348059f2715539d856f32eb6d03dd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and multiple external URIs, including one pointing to `https://allytemp.ru/uplcv?utm_term=liveme+pro+apk`. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=liveme+pro+apk
    • https://aksukartela.com/images_upload/files/surilonidipisakoxiz.pdf
    • http://kingalbertltd.com/uploadedfiles/file/22541848910.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3fc124f79---ganeli.pdf
    • http://gartenbaukoeln.de/uploads/files/97217959823.pdf
    • https://studiecarriere.it/uploads/file/sefogasafaboma.pdf
    • http://ikuma-car.com/js/upload/files/72041495694.pdf
    • http://bridgeonlaw.com/filespath/files/20210911003602.pdf
    • https://sgicorp.com/userfiles/files/fujorulus.pdf
    • https://webrobogo.hu/kepek/fegigikozegiguzaril.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613549b19d6b9---bopiwa.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/69585786066.pdf
    • http://alpha-cp.com/userfiles/file/togamuvoguwupuzug.pdf
    • https://mahanakhon.pacedev.com/ckupload/files/rogipozuzexevufibaziti.pdf
    • https://duproject.com/uploadEditor/files/29012455666.pdf
    • http://www.tobywells.org/media/fckdir/file/nadivorawox.pdf
    • https://gestionarival.com/userfiles/file/kizibimatanesoxukulupufut.pdf
    • http://obkladlazby.cz/userfiles/file/nibudijusuzu.pdf
    • http://csc028.com/userfiles/file/20210907003804_nhlczl.pdf
    • http://ieltsadd.ir/cache/fck_files/file/zutorag.pdf
    • http://gachbinhduong.com/upload/file/9116392197.pdf
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/somikebek.pdf
    • https://inprovitecuador.com/ckfinder/userfiles/files/22351652176.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_off0000c347.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC347 16792 bytes
font_01_sfnt_off0000db59.bin
5bc34de7475d1ba2d1055e002b055ddcb304100d90a2d0cafa76b0da6d7ddeca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 16812 bytes
font_02_sfnt_off0001073c.bin
3e490f74e49acadbfe2a01c84d4ccad603a1df5e4905737c07fa55f113d49756		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 10112 bytes

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