Malicious PDF — malware analysis report

Static analysis result for SHA-256 52578f751a179ac2…

MALICIOUS

PDF

76.2 KB Created: 2021-06-08 21:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d0d1e7db4c31f43eebd916c98d096d18 SHA-1: 2d8833e6df8e984e1a6271f7fe68f8d36380ed22 SHA-256: 52578f751a179ac20343b5f41e08133171f3ce8bad1ea63a5ea2c16c17a1312f
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 0.9956

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://smidgel.ru/pbw?utm_term=photo+lab+app+download+apk PDF link annotation
    • https://nugibunexediga.weebly.com/uploads/1/3/0/7/130740514/kedugorivezaraxe.pdfIn PDF document text
    • https://koworuvixoduto.weebly.com/uploads/1/3/4/3/134352933/914e7a480ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_60449224288e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403805/normal_602367b804326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447084/normal_60657c999dd08.pdfIn PDF document text
    • https://vebupixe.weebly.com/uploads/1/3/4/8/134854050/xumuxa-jovixapedelovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383921/normal_5fdb83ca40789.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420939/normal_600635ec9d66c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413110/normal_5fe03680d4d0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_605fa9f7c38ad.pdfIn PDF document text
    • https://renokogepebamon.weebly.com/uploads/1/3/2/6/132696434/6779978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423148/normal_6066b547dd7a0.pdfIn PDF document text
    • https://vulajavup.weebly.com/uploads/1/3/4/6/134683256/kekun-fapafufobofefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390097/normal_6054be13d9d95.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/b0e7560f-4078-427d-8a08-4c038869fb8a/28817865087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ebe0068-7316-47a8-8d9d-db68df377a45/wowal.pdfIn PDF document text
    • http://jadubunid.pbworks.com/f/wiluf.pdfIn PDF document text
    • http://pinurakus.pbworks.com/w/file/fetch/144548613/the_epistle_of_mathetes_to_diognetus.pdfIn PDF document text
    • http://zuwuzemoj.pbworks.com/f/harry_potter_and_the_cursed_child_movie_download_in_hindi_dubbed.pdfIn PDF document text
    • http://pefumugat.pbworks.com/f/subject-verb_agreement_exercises_advanced_class_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b84cd58a-3004-4ec6-8815-6a22aa254418/hp_officejet_pro_8600_failed_printhead.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b701cfd-49f8-4ae3-95e5-4d2c7be441d2/85840676952.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/52451862844.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/gewuxebememebo.pdfIn PDF document text
    • http://sejuworepow.pbworks.com/f/prentice_hall_mathematics_geometry_book_answers.pdfIn PDF document text
    • http://xodelow.pbworks.com/f/how_to_make_a_fake_plane_ticket_as_a_gift.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/imaginarium_train_table_instructions.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/w/file/fetch/144516336/analisis_pelicula_el_circo_de_la_mariposa.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_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 5072 bytes
SHA-256: f79a25c6a09aec9c73f6f11ee325dcd034af1aec10523083479ede15dce49860
font_01_sfnt_off0000fdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 10988 bytes
SHA-256: 926c3794691f846973b194a410761ff6f9c965f92a8fa737511484c316c71ffe