Malicious PDF — malware analysis report

Static analysis result for SHA-256 f911803b55ea4a03…

MALICIOUS

PDF

63.3 KB Created: 2021-04-28 08:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca184448d914e045495ec7482a1bee0f SHA-1: 219d17a5d5ae13f61252c085566a7016702d45e0 SHA-256: f911803b55ea4a031907e96f90529c856a31260551ffcc7d57e2133506274ee7
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a suspicious URL, which is likely intended to deliver a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'ggplot2 cheat sheet r'. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e96e15a765---kokirimenu.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/es80ajupgsj6i0bnar30fj3k10/15568948319.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d804715cb3---zuvemutep.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087a5f88e510---vorosub.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739071be987---gabamiwavogumozituloga.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1844e3a58---letunuliwevamojibegawu.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/691e2e6a6b2120e5a4da1abdb7913600/97522525197.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/f9mii0826htrh4lvjcj9p29952/88444089637.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/rl658h4db9v948su63pr6sg053/koremixisu.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca13fea47e---pagoxejufarepax.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607255e9e6980---83199638439.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e76c1b7a5d---votutonutajibe.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4cb0996680b99411cc7c7a795b33c0c8/37221106360.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/14dd8c1a5ac8476b1337bf590d66a38e/budawutijigamokixosiw.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f6804fa16880d3a5cbaae8708d7e2980/befixawevejoxulu.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833233ef155---vasadizokijej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ggplot2+cheat+sheet+r
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd47.bin
b26b3a69871daaf84d691d7b3e221f43e44b08f23288d5433da7326b905b85fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD47 5356 bytes
font_01_sfnt_off0000cf7d.bin
da6f35e974cc860c6a88ecfbe7036338831dd578369c827c9242190843e06fde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 9672 bytes

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