Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b3963036dbd8ef…

MALICIOUS

PDF

74.2 KB Created: 2021-04-06 13:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 036a5dc909e031b9cc46bbb9b7252d2e SHA-1: 39fb5b957e665b3d83602a8a9500f8a5e2ae1ab7 SHA-256: a3b3963036dbd8efadfd2cb0f7086940a9ff05d9a988799e350096efcba505d7
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://zajinet.ru/123?utm_term=animal+planet+live+app PDF link annotation
    • https://cdn.sqhk.co/fepogosu/jfEJsii/the_trip_to_italy_soundtrack.pdfIn PDF document text
    • http://photoforce.ru/duzasuketesuxakaroe09r6.pdfIn PDF document text
    • http://dukobotabagujam.22web.org/bawasesokexawudel.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/pdf_blockchain_revolution.pdfIn PDF document text
    • http://uscreditscore.info/jelagujusututisofuvorrcxsp.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/djeWvhj/occasional_insect_invaders.pdfIn PDF document text
    • http://miwezewavokalar.iblogger.org/rubapoganafoxi.pdfIn PDF document text
    • http://dapovevi.mywebcommunity.org/15049151086.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486566/normal_5fe33fb038828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407998/normal_6045089485c8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wapemufabaloni.rf.gd/oral_lichen_planus_an_update_on_pathogenesis_and_treatment.pdfIn PDF document text
    • http://wakedozalol.rf.gd/support.nintendo.com.error_code_51099_dsi.pdfIn PDF document text
    • http://mutifesojare.epizy.com/envision_algebra_1_workbook_answers.pdfIn PDF document text
    • http://zovebosovu.rf.gd/sheet_size_chart_us.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_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 4740 bytes
SHA-256: d1b68cc47254fdd0a46cce1e5f2ecaf3cde022f48406344371699fe63fdc1790
font_01_sfnt_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 11104 bytes
SHA-256: 5b6b2a16edadbc90a0f32baec5c87b340d6cf7174596bb44dd3f734327f08db4

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