Malicious PDF — malware analysis report

Static analysis result for SHA-256 742eb955ffce413b…

MALICIOUS

PDF

73.9 KB Created: 2021-02-23 14:56:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 466a716f7601e696c9992c095b3866fe SHA-1: 14f46680b382d72d97e837c032ec9f8a760f20d6 SHA-256: 742eb955ffce413be033a53383f0ac5126973f9906589373611198b2eab33c10
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URL and the nature of the heuristics point towards the document being used to redirect users to malicious sites, likely to deliver a payload or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=julius+caesar+characters+ppt PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373008/normal_602d82b5a2b3e.pdfIn PDF document text
    • http://eeeeeyyy.space/58155931285x7ad7.pdfIn PDF document text
    • http://noverst.xyz/anatomy_and_physiology_lab_manual_mariebxgfw8.pdfIn PDF document text
    • http://vixerixobo.22web.org/carrie_movie_2013_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486033/normal_602d47540663b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_6022115ff3b53.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/silence_is_the_language_of_god_all_else_is_poor_translationd0aoi.pdfIn PDF document text
    • http://rotixumuzu.22web.org/classic_bulldozer_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482413/normal_5ff56b9763415.pdfIn PDF document text
    • http://deworul.22web.org/zizivifelifaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379371/normal_6005d9c58bf5b.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/avje2UQ/nimamumizotewukol.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zifosasexinedi.rf.gd/apa_format_6th_edition_example_bibliography.pdfIn PDF document text
    • http://dapubul.rf.gd/nikipuxewuma.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 1872 bytes
SHA-256: cf373f8eb364677dc8d29ae0cbe658a1b8665e9067f0cd69b3a2e84d4b370a53
font_01_sfnt_off0000e41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 5008 bytes
SHA-256: 1a6ac24c665b5a9a1f0ce8bed131351d999672f9786d3a572b1289f7aeb00147
font_02_sfnt_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 10384 bytes
SHA-256: 09cb05d3abd160ac762d2d9f245c226ed7e908014173c635986369a520f4b9b8

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