Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d40b797b50ed14…

MALICIOUS

PDF

81.2 KB Created: 2021-10-21 02:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 045b2b1e71a3e1e9f7ef24e2f496e321 SHA-1: 646861063063f88715dedb83991db829a76d85ca SHA-256: 71d40b797b50ed1457107e9fefbbc76d039166cc54f2839b54cf80bb8d048460
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to one of the listed URLs for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=everytime+i+lay+down+my+back+hurts PDF link annotation
    • https://www.tvmreza.tv/ckfinder/userfiles/files/ragulenenetezilazeweb.pdfIn PDF document text
    • https://fundacjacat.halpress.eu/userfiles/file/87813292080.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/7939100832.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/23453610774.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/sadetonazibemutalitu.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/nenanegadaxena.pdfIn PDF document text
    • http://glttek.com/userfiles/file/55774038654.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/77960846775.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/56554839245.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/13381998624.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9cb1d5fa9---xusagazun.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/bofaw.pdfIn PDF document text
    • http://handmade.sdelaemlegko.ru/files/userfiles/files/wisavupef.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/zerodixabatoneke.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/pomov.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/71056834123.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/jerufitebeligagominavi.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/99736811111.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/pogivafi.pdfIn PDF document text
    • https://hoalavender.net/upload/files/supumolimokenenutikikid.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/28839047585.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/70752693849.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/jupesar.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/81889884523.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/fugofunilinakowar.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_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 16880 bytes
SHA-256: 52df2e756c6e5207b5b529db8621cf8f5e41dd674670faf623b200bca3be45d9
font_01_sfnt_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 11216 bytes
SHA-256: 02c07c1716afe751832d59345f44726cd4e86324e2dda0200da391a92afb2b6c
font_02_sfnt_off00011f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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