Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d87db3157d66d4…

MALICIOUS

PDF

82.7 KB Created: 2021-03-29 06:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ad6d90773b759faa8653a067cab51d95 SHA-1: 11a05710c980c642246ca9dc91f3dd3ff61121d3 SHA-256: 52d87db3157d66d49edcfd219c2190c6f7d77f0a39c8f9164b5d83b74229c935
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://golowaki.ru/aws?utm_term=how+much+is+eva+larue+worth PDF link annotation
    • http://shop-kid-toys.online/where_abroad_is_warm_in_februaryctmjb.pdfIn PDF document text
    • http://gebuzof.22web.org/how_to_connect_playstation_gold_headset_to_ps5.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/bXdhcha/62050882460.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/IihMNia/tower_defense_crush_hack_mod_apk.pdfIn PDF document text
    • http://wejnpowk.space/14499933481zrpqy.pdfIn PDF document text
    • http://lastasked.com/background_eraser_app_androidzy3ct.pdfIn PDF document text
    • http://ighelpcenter.xyz/rebelion_en_la_granja_libro_resumen_por_capitulos9nyha.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/book_of_the_damned_pathfinder.pdfIn PDF document text
    • http://sekejibugu.iblogger.org/is_nancy_drew_going_to_be_on_netflix.pdfIn PDF document text
    • http://eduha.online/the_100_season_4_episode_10_wikimhf4g.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/hKvEggi/12956081672.pdfIn PDF document text
    • http://kuvuradivikosef.iblogger.org/analog_film_photo_filters_premium_apk.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/dixaleko/meliwosef.pdfIn PDF document text
    • http://kenamumiv.rf.gd/farberware_pressure_cooker_guide.pdfIn PDF document text
    • http://gakuxalodakedaj.epizy.com/comma_splice_worksheet.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/plantronics_voyager_edge_bluetooth_headset_with_car_charger_and_clip-on_earloop.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/81841107707.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/dupeta.pdfIn PDF document text
    • http://xewipevi.rf.gd/your_song_piano_sheet_music_c_major.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_off00010362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10362 5152 bytes
SHA-256: 1ea3858fae13c3e459363421cbbf803ef72c8a97d565962f5ed9558caea558f9
font_01_sfnt_off000114d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 11768 bytes
SHA-256: 27210930ce07abd232795e9ff6c269a36077851373e0c1d3c93e8a3e756f3584