Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfac411369e0de7f…

MALICIOUS

PDF

70.4 KB Created: 2021-09-15 20:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c88087f300fd36907f89460ceef6f30 SHA-1: 58a8f2f1e635dd5e00d009b4fbe17649d9679911 SHA-256: dfac411369e0de7f0f100ac9c6a0f26094dc085d3c993393d65087480597310f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the sample, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://sklepjola.pl/userfiles/file/9095853740.pdf In PDF document text
    • https://tonerihned.cz/userfiles/file/sajez.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/siwexolarokotelusa.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/vadowu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc425a6e1---44087906087.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/89403860623.pdfIn PDF document text
    • https://greenways.at/userfiles/file/35373485748.pdfIn PDF document text
    • http://pasted-radio.de/web/files/letopimotexule.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/pomapimunubitoni.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd5365822---xebuletadagerudes.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/gariboral.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210904131252566394.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/pelokabobo.pdfIn PDF document text
    • https://hoongnau.com/upload/files/nemuludin.pdfIn PDF document text
    • https://invision.buzyhub.com/files/meterurafosopigelir.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210914082016181.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/18976282277.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/likapodunexoxaxokobirono.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/setovarazepumom.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/sazawebofamevimotok.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/47808743702.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/85948463013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=add+pdf+to+google+docPDF link annotation
    • 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_off0000b5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B2 15608 bytes
SHA-256: 047cd6377190b76a92e7d2769b612ad8fc25121a1493d2a3397afdf7cbbb6ed0
font_01_sfnt_off0000dd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 10152 bytes
SHA-256: 6609ac270876e4f5fc84fc5e680c26e85d415671e8b1ce3e00b0af210da8621e

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