Malicious PDF — malware analysis report

Static analysis result for SHA-256 9885798548e19373…

MALICIOUS

PDF

78.7 KB Created: 2021-06-04 09:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a5b80715b4c8b25951e357960820d109 SHA-1: b0866105b70fe35c3eb2e5a2420edb0dc14ac790 SHA-256: 9885798548e19373556455de7ac18665805c4ed557dc0c6157a9bf1eaa31139f
126 Risk Score

Malware Insights

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

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 0.9997

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://midufefew.ru/123?utm_term=parkitect+decoration+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403563/normal_5ff758e530b78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_60b8b225b31bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_603883fed6463.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481671/normal_5fc61865800ae.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4420760/normal_60b30723bce27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_60433a5293f5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pafunanukexe.pbworks.com/f/colons_dashes_hyphens_and_parentheses_worksheet_answers.pdfIn PDF document text
    • http://serizedez.pbworks.com/f/jofilesidilititadaxano.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/w/file/fetch/144594519/toutes_les_doctrines_bibliques.pdfIn PDF document text
    • http://ropotupi.pbworks.com/f/completa_las_consecuencias_sociales_de_las_reformas_borbnicas_para_amrica.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/f/gonisugakaxul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a84f38-05df-494b-9930-649d8d93f9f4/11639053685.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144428013/advantages_and_disadvantages_of_land_expropriation_without_compensation.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/75780547423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a497657-faec-4c89-94e0-9722c2b1dca0/the_aim_of_psychology_is_to.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/add_and_subtract_fractions_lesson_6.5_reteach_answer_key.pdfIn PDF document text
    • http://molitutolu.pbworks.com/w/file/fetch/144559143/download_video_film_ada_apa_dengan_cinta_2_full_movie.pdfIn PDF document text
    • http://gazumadu.pbworks.com/w/file/fetch/144467406/definicion_y_caracteristicas_de_la_investigacion_cualitativa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b362dd-8542-462c-a494-4c3fce816344/19912504689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3c57f2e-d0f1-4120-9612-f50e932a9f1a/pibikelaf.pdfIn PDF document text
    • http://namikikis.pbworks.com/w/file/fetch/144518859/59727254043.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_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 4964 bytes
SHA-256: 6e61b906babcd415151176175bd2e244a5b10cc43a58b0628bf48a8eaba1aadc
font_01_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 10872 bytes
SHA-256: a1fdb4e7865cfae0aaac9f38d2538f2bc5fe0824f2287cad12c4e68d407beba9