Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9af9c7dd55d2e1…

MALICIOUS

PDF

74.1 KB Created: 2021-03-17 12:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22082d76a234845ad93808379ec14578 SHA-1: 1826c5b4191cb7723a280ad68b1761a9cb4b220e SHA-256: 0e9af9c7dd55d2e1286870560e9846dbe5eff51ea857fd9f95f34e0f4313db67
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a machine learning model and ClamAV, as malicious. It contains numerous embedded URLs, with one pointing to 'https://vilenefex.ru/123?utm_term=door+lock+app++com', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://vilenefex.ru/123?utm_term=door+lock+app++com
    • http://likefetevu.getenjoyment.net/53769133807.pdf
    • http://xajavawinereko.mywebcommunity.org/68877970676.pdf
    • https://cdn.sqhk.co/rotogogoji/dhaHjeD/lijeporupoxiruruzotuwa.pdf
    • http://jedilinosur.mywebcommunity.org/72296009099.pdf
    • https://cdn.sqhk.co/viwiratoposu/38gdidZ/nalonivogolovafuvurixazof.pdf
    • https://cdn-cms.f-static.net/uploads/4497346/normal_60340cb866492.pdf
    • https://static.s123-cdn-static.com/uploads/4384310/normal_5ff1d7299eefa.pdf
    • http://miraluvofizobe.medianewsonline.com/91368286586.pdf
    • http://takotonefajale.22web.org/wedodapaxewifuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rodedewezijore.atwebpages.com/69578227877.pdf
    • https://s3.amazonaws.com/xamibudasagas/trigonometric_identities_worksheet_answers.pdf
    • http://jofijegisa.atwebpages.com/linkedin_profile_optimization_for_dummies.pdf
    • http://nejimafalun.onlinewebshop.net/13726540786.pdf
    • http://nuxavezuzoja.epizy.com/shadowrun_returns_dragonfall_etiquette_guide.pdf
    • http://zorikeroz.onlinewebshop.net/convert_to_word_free_download_windows_7.pdf
    • http://gozudil.onlinewebshop.net/sheet_metal_forming_tools.pdf
    • https://s3.amazonaws.com/votawawo/79113742555.pdf
    • https://s3.amazonaws.com/biwubeleba/go_math_florida_3rd_grade_answer_key.pdf
    • 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_off0000e6f0.bin
aa31b924dfc17059e0c442a1bf6bf7b1d12960df07dd7bfa8db9c034ba501a13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 4964 bytes
font_01_sfnt_off0000f7c6.bin
8a0ba723fe26f8c099c30e87772bdcd16bc990af851e41958c2457032d70b18c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C6 10472 bytes

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