Malicious PDF — malware analysis report

Static analysis result for SHA-256 9949d80b34c764da…

MALICIOUS

PDF

75.1 KB Created: 2021-03-02 01:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9f03ef7e79e2d3d20bfeeb0cdb86af64 SHA-1: 322a5968842d450908a0ba64a0b5a1001a9ea402 SHA-256: 9949d80b34c764da6d6db952717e9be2c668e5acae22df455166aac93d311155
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for linking to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The presence of these links suggests an attempt to direct the user to malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the overall structure and heuristics point to a malicious document.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=sansui+television+customer+care+number In PDF document text
    • https://cdn.sqhk.co/betewulo/Pgfezqm/subway_franchise_application.pdfIn PDF document text
    • http://egrn-order.online/93144107612gfdb2.pdfIn PDF document text
    • http://alkostore.xyz/1610736438s1y0k.pdfIn PDF document text
    • https://mobefoba.weebly.com/uploads/1/3/0/7/130776725/c79c922.pdfIn PDF document text
    • http://azorocheat1.xyz/rapadadawapitjrm9f.pdfIn PDF document text
    • https://lizelizana.weebly.com/uploads/1/3/1/4/131409616/riponolumas_zufix.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/hihgdG4/kupafawiwevixetu.pdfIn PDF document text
    • https://cdn.sqhk.co/degixodip/HNhghij/maxagaxaworuruwalezogoliz.pdfIn PDF document text
    • http://matrixbicycles.com/antigona_sofoclesemuwz.pdfIn PDF document text
    • http://blog-millionaire.buzz/technical_aptitude_test_questions_and_answerscu554.pdfIn PDF document text
    • http://grenkasalo4.xyz/doneduxabobazwfdtr.pdfIn PDF document text
    • http://yourdesk.website/50464983267dadru.pdfIn PDF document text
    • http://trackengine.host/81426161028ax5qt.pdfIn PDF document text
    • http://instapodarok.site/computer_system_technician_salary_in_canadabygr0.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/z3LLgcu/rofugexamoti.pdfIn PDF document text
    • http://trysol.xyz/44846399682c0y5r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 5248 bytes
SHA-256: cfabc84bb5d10ea0aa6c2ea2c9f8fa0211933a6e9a497f721a31f63c69b2ebfe
font_01_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 15744 bytes
SHA-256: 5df60c4fa09042917a597600d2cb9a1382909003f9a263734a8a931a4de3ff9c

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