Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba261f473abdc01…

MALICIOUS

PDF

61.1 KB Created: 2021-02-19 23:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b548f746a6a81c8797e1f9e68e618ad SHA-1: 306cf9cfe53d9053511cf0dd316307381b400208 SHA-256: 5ba261f473abdc01d4c630b632126f8a5b2461334b44205566c5d94229a5ba89
184 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often abused for creating malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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.
  • 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=how+to+use+blue+water+ultrasonic+humidifier
    • http://maretexojud.66ghz.com/bihar_bsc_agriculture_form_2019.pdf
    • https://netebina.weebly.com/uploads/1/3/4/5/134596662/tusidedis.pdf
    • https://pedogore.weebly.com/uploads/1/3/2/8/132815008/jepujodawat_tuwotofadifuret_tuvanudoxe_ronesavipefa.pdf
    • https://fefumuvujudadi.weebly.com/uploads/1/3/1/6/131606087/7540037.pdf
    • https://buvokatawun.weebly.com/uploads/1/3/1/3/131378806/givaxikebela-pesafit-pibewabepog.pdf
    • https://sawulazu.weebly.com/uploads/1/3/4/5/134588127/rakilapigulapixev.pdf
    • https://cdn.sqhk.co/pefatipi/xgjeMjc/minakipikakafinudasexo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mudopijafaj.epizy.com/visual_studio_android_emulator_localhost.pdf
    • http://buwomir.epizy.com/bhakta_markandeya_tamil_movie.pdf
    • http://kezasifofajimo.rf.gd/rubber_stamp_font_dafont.pdf
    • http://vonizevugopu.rf.gd/customer_journey_map_free_template.pdf
    • http://redexini.epizy.com/history_of_computer_file_free.pdf
    • http://vutafinaragod.rf.gd/sumurab.pdf
    • http://lofadekiwi.rf.gd/the_fact_of_blackness.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_off0000b5d4.bin
f8a4d30865fc0e906b2390f45aea8c68a3190a894f2a910c26ef27365c073967		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D4 5452 bytes
font_01_sfnt_off0000c841.bin
8fd6bc78de4c662b5511d11a29df9086f60e23d4d1c5690474f3cb09e9b1e607		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC841 9028 bytes

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