Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f79c9b928673652…

MALICIOUS

PDF

80.4 KB Created: 2021-06-08 19:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f2c99b31bcbf66da0a9f91046d182c69 SHA-1: c66c9e932918dd0f776d7407da60e9ab244797e7 SHA-256: 8f79c9b9286736528f5548435f4e97d306077cb55a7ed8bbd107d610091cafc9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://ponafet.ru/123?utm_term=agricultural+research+institute+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370097/normal_60b920d2aa191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_60653cb9a5de3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478932/normal_5feb351ce3291.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/f240cc95-128f-4a15-bf85-b1a01a7288e5/2086340530.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/f/cours_allemand_a2_gratuit.pdfIn PDF document text
    • http://jowenoxo.pbworks.com/w/file/fetch/144549942/how_to_use_loops_and_threads_knitting_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6793a05d-9300-4b0a-a0ab-f810ad409832/onn_roku_tv_black_friday_2020.pdfIn PDF document text
    • http://sonubugu.pbworks.com/f/34054063148.pdfIn PDF document text
    • http://popuwepux.pbworks.com/w/file/fetch/144647280/cqc_essential_standards_of_quality_and_safety_2018.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/woxidirovamugijumebijimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25569b2-c4e2-46bd-987d-b473938d0502/40919462136.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144442881/bahubali_2_full_movie_download_in_hindi_hd_filmywap_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb3436d-32e2-446b-b717-6d937a16487d/jigapuxobobatofumezasut.pdfIn PDF document text
    • http://fuzujufod.pbworks.com/w/file/fetch/144663114/nutitupusetizilezexapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/742cb85b-8f10-4f86-b3bf-cb949ffbbb90/math_equations_greater_than_less_than.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/f/9_snf_kmeler_alt_kme_konu_anlatm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da84107b-0c25-4151-bc5b-7fa59e5f206b/peter_pan_and_wendy_disney_plus_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd29a09-7868-49d4-b24b-bde5d9f5e6fb/93880439874.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/62789113058.pdfIn PDF document text
    • http://finatin.pbworks.com/w/file/fetch/144614253/9041301456.pdfIn PDF document text
    • http://tozuxexap.pbworks.com/f/how_to_pair_jbl_flip_4_to_iphone.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_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 5408 bytes
SHA-256: e4f4c966bc56f91e01a6e2bb543489de78f33913880078df2d13ea7ab65a916a
font_01_sfnt_off00010e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E99 10968 bytes
SHA-256: bae0d1c462f688af0d084de8c7de910b3f41de8fb73c3df59fec19030ef55282

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