Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8550362143c97c1…

MALICIOUS

PDF

85.9 KB Created: 2021-03-28 14:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ffccc89c39b0204cb573f2f5ba10c26c SHA-1: c81b9b51fcd388a4d1757f18b70075297d770170 SHA-256: c8550362143c97c13f453e92749164e89e34ef037c64ab35562eb43bfa09743f
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs, with one specifically pointing to a URL that appears to be a redirector for malicious content. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=epson+ex5220+review PDF link annotation
    • https://cdn.sqhk.co/salusasopuvi/MIifET1/joker_wallpaper_hd_iphone.pdfIn PDF document text
    • http://mawifit.iblogger.org/iptv_apk_with_epg.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/wAaageX/tilazaxazakinoxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491410/normal_605799fee857f.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/jgcOiaX/hypixel_smash_heroes_how_to_get_coins_fast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_600e3f1fa37ce.pdfIn PDF document text
    • https://cdn.sqhk.co/wasulevilid/jhgcjdk/funulofetekumegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466165/normal_603515bd1484d.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/7NJPtFp/how_to_learn_javascript_faster.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/sgeKXKj/40057588822.pdfIn PDF document text
    • https://cdn.sqhk.co/wekababu/eM1wUSi/swot_analysis_for_marketing_environment.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff431d5-8bf4-419d-9268-88c2a4eed178/el_llano_en_llamas_english.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/ultrasound_scan_report_boy.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/best_free_spoken_english_app_for_android.pdfIn PDF document text
    • http://xidozine.rf.gd/working_of_breather_in_transformer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/788a5887-12c4-4a76-89a8-e8d61f6e27b7/magnus_chase_the_sword_of_summer_movie.pdfIn PDF document text
    • http://timojakizufijad.rf.gd/55831586245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/409d2ee7-22ed-4d68-8f35-dd5acf611f4b/the_maze_runner_film_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cacb5c2e-5492-4621-b8c2-d619d8f5b150/nutuvadozisosenavakinuw.pdfIn PDF document text
    • http://satavemuso.rf.gd/67100434008.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/emergency_medicine_residency_reddit_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9caa7b24-be96-4ddf-9189-5f95230ad8c0/musotobogezojapodaxibije.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001136b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136B 5144 bytes
SHA-256: 538a4ed75d52556b40bca92512da377c77d4b90ed9b2f5d7be5029e5285d17ee
font_01_sfnt_off00012521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12521 10924 bytes
SHA-256: c7b54155df8ee3dfcd8874175768c9f21c3c2298cbc8c8a6beed8b34ec837e43

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