Malicious PDF — malware analysis report

Static analysis result for SHA-256 280f8fd1cff2f194…

MALICIOUS

PDF

88.4 KB Created: 2021-04-18 16:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c9d240d4385ea7cb93e7401ffc54f186 SHA-1: 42ee7f0f84f55fd69ae246c9ad275bccfc1ea52c SHA-256: 280f8fd1cff2f1949cd59e71a76f89a516af6441b386d5928f82fc139cd4a1ce
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL pointing to a suspected phishing or malware distribution domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, likely to obfuscate its true purpose and spread malicious content across various domains. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=canon+rebel+xs+d1000 PDF link annotation
    • https://cdn.sqhk.co/xunixenovapi/jMVgEfz/49473145232.pdfIn PDF document text
    • http://tifowarevonet.iblogger.org/gofakese.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/ihG69PV/10187796788.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/kMgfich/99877326357.pdfIn PDF document text
    • http://talezoruvaje.iblogger.org/90973455181.pdfIn PDF document text
    • http://pazobano.iblogger.org/bajrangi_bhaijaan_movie_ka_song.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/aaJjbji/beginner_ballet_classes_for_adults_nyc.pdfIn PDF document text
    • http://zekifafeter.scienceontheweb.net/convert_cdr_file_to_software_free_download.pdfIn PDF document text
    • http://kononameve.mywebcommunity.org/zebrafish_life_cycle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/77589559669.pdfIn PDF document text
    • http://bafilus.epizy.com/37864119932.pdfIn PDF document text
    • http://validexa.epizy.com/how_do_i_program_my_vizio_soundbar_to_my_spectrum_remote.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/51324177415.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/kaluzevatax.pdfIn PDF document text
    • https://4db61c00-1078-4917-8a1c-a2c1480eb6e0.filesusr.com/ugd/c94206_84e803b341674f46a1f71d7e3ce8349b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/hard_hearted_hannah_sheet_music.pdfIn PDF document text
    • http://sefudupufojuxo.rf.gd/retail_marketing_book_by_dr._l._natarajan_download.pdfIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_800c7ad7f82341f88b7892f916eb30a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/pronunciation_practice_worksheets.pdfIn PDF document text
    • http://mawarine.epizy.com/marutidizudelojadix.pdfIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_e4184309bd1c4aecb53cbf5d7615039a.pdf?index=trueIn 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_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 4572 bytes
SHA-256: 18b49b3fc69881cbafe63bb8ace801b025dfae77d65e5702a0e78b58ea12d7e8
font_01_sfnt_off00011acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 5128 bytes
SHA-256: e1c745bd4a8d61fd3a8155737c6b94ca42ee32557720d758ec742891bdab40ad
font_02_sfnt_off00012c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C45 11204 bytes
SHA-256: 0c04285c5fc7c6534a27cd65cfe08869f7fbbaaa5c10cfd504b191cf3c7e8e49

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