Malicious PDF — malware analysis report

Static analysis result for SHA-256 a530e306251634a7…

MALICIOUS

PDF

70.3 KB Created: 2021-03-09 18:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2b003f0ebe3fe6b93da1d4878587e7e1 SHA-1: 17bd48585ec40e91cad5b122916e89c9e6c74d25 SHA-256: a530e306251634a7a4ac34c2e03fcc9b0371a6a7fbe60106858d56f7d161e2cd
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 0.9998

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://vilenefex.ru/strik?utm_term=troy+bilt+tb110+carburetor+lowe%2527s PDF link annotation
    • https://cdn.sqhk.co/maxegugej/heicNvE/zifozamadojuwekitaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_60187c2ee95aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454051/normal_5ff926916eba8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490974/normal_5ffa4ff079375.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/vemowatewugixosari.pdfIn PDF document text
    • http://hookup754.fun/vuwaxesudumejrawxt.pdfIn PDF document text
    • http://kajipim.mypressonline.com/first_ten_cube_numbers.pdfIn PDF document text
    • http://republvinb.fun/journal_of_statistics_applications_and_probability_lettersf59r5.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/8hdIuUx/gixosapuvopaxaxa.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/what_is_a_good_quote_about_family.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/bf1dca11-9e46-404d-9998-9205c60b99f0/algebra_linear_equations_word_problems_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f594d1c-0f86-448f-b6dd-7e6b2929c9c2/76077962187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e7a084-962a-49e3-af7a-f177d59dd578/jatipakagamexokuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7400be88-314a-4d39-aa58-0f2065463fe4/chicco_keyfit_caddy_stroller_frame_buy_buy_baby.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6415dd78-4efb-4c7b-b450-6b39aa1000f4/unit_7_worksheet_1_mole_relationships_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b253ae86-9968-45af-a9f7-f61881135cf7/how_to_reprogram_schlage_keypad_lock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453413b2-4ac7-4c16-bb33-94ffe809402b/nixon_sentry_chrono_all_gunmetal_42mm.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_off0000d458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 5304 bytes
SHA-256: d87986eeab3b0a5a3825f5d5bfad3099ff6ba30ab6834aab39a99b55d03302b9
font_01_sfnt_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 10948 bytes
SHA-256: 87e5679deb0b54a8ed019942c653bfa5a6afc9cd4ba12ed0d44165b03a557907

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