Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7fa045799b4f41…

MALICIOUS

PDF

83.7 KB Created: 2021-03-18 18:35:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2574b32fe48aa952a5afe001f062ee2e SHA-1: 8e6c69972190bd3e356d718a867464ff87a11ad8 SHA-256: 3a7fa045799b4f41dbd5cce91cbbfd11b6fff2dbae0e9e8abc9a54ebe031bf51
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to dashboard warning lights, which is likely a pretext to entice users to click on the malicious links.

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
  • 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://nipisod.ru/strik?utm_term=what+does+the+yellow+triangle+on+my+dashboard+mean PDF link annotation
    • https://cdn.sqhk.co/xumobopore/hjbgdjh/daludekosigimugegex.pdfIn PDF document text
    • https://cdn.sqhk.co/nagigureti/jigjdhc/skull_wallpaper_4k_for_android.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/76359730301.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/Y4Tibij/taniv.pdfIn PDF document text
    • https://cdn.sqhk.co/jefigujaxev/ngfhfgg/79269981824.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/jai9rjj/41073949871.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/ic9jcia/puburosol.pdfIn PDF document text
    • http://zukesijinizik.mywebcommunity.org/bowevukejonuziviwa.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/6ghwCif/dofoboga.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/hahijge/36421199709.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/76083783439.pdfIn PDF document text
    • http://manibupefif.mypressonline.com/vamitalo.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/uT9DEjh/furious_tank_war_of_worlds.pdfIn PDF document text
    • http://waranijovuv.sportsontheweb.net/60877170843.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/adjectives_to_describe_places_esl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gixarewujedel.atwebpages.com/7142555540.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/puzowudajovux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76249fb-461b-4893-9527-a45d76dc79d8/74148874737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/880f5186-3080-4a03-8672-c3dca067ece4/83427142033.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 5584 bytes
SHA-256: 0b54453be29743fb8eea53bdea32fdd738317a5b822903be4627526293893dcd
font_01_sfnt_off00010c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C01 11088 bytes
SHA-256: 16f0a316fda6fb57d26e87cc68a11fc4b93201f4bfd99432fac625764ff9d21e
font_02_sfnt_off000131ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BA 6128 bytes
SHA-256: 82caf478ec356c1625b799fe5773cae3dda684b4d845119e6c835c64458f2ead

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