Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7775dcaab264d7…

MALICIOUS

PDF

72.8 KB Created: 2021-09-30 14:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b43f9aa9cc65e41a2d4a523827573974 SHA-1: 09f28232d913e7e29198e99d7d25864890f92933 SHA-256: de7775dcaab264d71e753fd44a3c803d3b3eab584a03aefa6879021a23182742
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to potentially 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 0.9973

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://mskabel.cz/UserFiles/File/52318520293.pdf
    • http://hangnhatbanonline.com/upload/files/sudiw.pdf
    • http://medianet2000.net/amm_prod/image_news_popup/file/84803604056.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/zitupotijupisuwuwutoga.pdf
    • http://evolutionchonburi.com/userfiles/files/60249912368.pdf
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/pejugosuzalafasibaf.pdf
    • http://madmojo.com/fckupload/file/25676030674.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614fac1921b76---turakevurakesinamej.pdf
    • http://friend5190.xyz/js/ckfinder/userfiles/files/lodazaburod.pdf
    • http://gamjagolla.com/uploads/files/kijopeb.pdf
    • http://mtecommerce.it/public/news/file/61382557971.pdf
    • https://thuaphatlaihanoi.net/uploads/files/92692659065.pdf
    • http://apnm.indexint.net/ckfinder/userfiles/files/migebesigekaloteza.pdf
    • http://p-itos.net/admin/userfile/image/file/74608413814.pdf
    • http://kossuthdigisuli.hu/userfiles/file/jalusipupuvofon.pdf
    • http://abwpetersburg.com/uploads/files/19193153784.pdf
    • http://boki.hu/editor_up/zunujanimixavogujavididi.pdf
    • https://pro-biomed.com/admin/userfiles/file/basesaba.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/7atlfahcdl4oogikv7qjkght51/32281317071.pdf
    • http://volkshilfe-ktn.at/images/content/files/wuvovitafudejuzavobowifa.pdf
    • http://tcsklife.com/filespath/files/20210910161055.pdf
    • http://parentini.it/userfiles/files/26525453733.pdf
    • http://vizcsap.hu/files/file/nutinuroweraneponavuta.pdf
    • https://dycmc.com/DATA/upload/files/202109201101374620.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gdrive+for+android
    • 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_off0000b8a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A5 16792 bytes
font_01_sfnt_off0000d0bc.bin
68cf6ee2d7e18f6e0582940d9735aaff50c51e018d40ed35ab35636fab46a1ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BC 10140 bytes
font_02_sfnt_off0000e786.bin
4c8dda1edbfea0f3c7c91717fae3827b8672164a69a79237260b99b49fd90f83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 17804 bytes

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