Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fb76042b4ab7c2…

MALICIOUS

PDF

78.7 KB Created: 2021-02-11 22:35:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a101cb8663abe2753dd91d8da2db1441 SHA-1: 710d36eddb5279307cf2adbaaa96fc4143ffac0e SHA-256: a6fb76042b4ab7c239795730a537516c7a6fdb0e2e149223711a0713a9b27f4c
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that redirect to potentially malicious sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lure users to download further payloads or engage in phishing activities.

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 links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=visualize+worksheet+3rd+grade In PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/a1jhaij/vutogeketizatofo.pdfIn PDF document text
    • http://bidusifekinu.66ghz.com/68790278467.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/7AHJhiu/snake_3d_game_free_download.pdfIn PDF document text
    • http://bunnygummy.ru/35618170744ai6mb.pdfIn PDF document text
    • http://wifefavowe.iblogger.org/arm_cortex_a8_datasheet.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/5ThdijH/deer_valley_phoenix_hourly_weather.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/yXhjifC/download_minecraft_egg_wars_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/dHgwEjj/skydrive_stock_flyball_size.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/2Ogfx1S/radiologist_schooling_requirements.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/Wjehibz/pc_simulator_games.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/tamobalasu/gold_shield_logo_template.pdfIn PDF document text
    • http://kaposedujeterod.epizy.com/rise_of_civilization_mod_android_1.pdfIn PDF document text
    • http://nonogopikizezed.rf.gd/500mb_mkv_bollywood_movies_free.pdfIn PDF document text
    • http://zifasodokid.epizy.com/colorado_rockies_hockey_uniforms.pdfIn PDF document text
    • http://wiwawilif.epizy.com/epidemiologia_clinica_aspectos_fundamentales_fletcher.pdfIn PDF document text
    • http://japixunatavaxi.rf.gd/hermiston_oregon_police_reports_2019.pdfIn PDF document text
    • http://fugewad.rf.gd/94553618611.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/la_cicala_e_la_formica_restaurant_rome.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 5420 bytes
SHA-256: 57fc37e54dac462b62c2eb8e8eedcf81a7dc073bf6d34ab7af13c9a34642d826
font_01_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 10660 bytes
SHA-256: a61c2369f55a9d9b002ebbd92b92bba17e4568a79e3110d7409bb3be17be46e7
font_02_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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