Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61fb759dfec7cd1…

MALICIOUS

PDF

92.0 KB Created: 2021-03-24 03:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0f45fe28d821889eb7c6da0e16102e24 SHA-1: b81881d74e257bb729f7542cd8ac70ab134be4e2 SHA-256: c61fb759dfec7cd188771b4ddeefd008d3dec88941533012f3cf994cc8bfb46d
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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/award?keyword=life+cycle+of+bacteriophage+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388280/normal_6059f40386b11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483359/normal_5fffdf7dae345.pdfIn PDF document text
    • http://beautysale.site/61561831316pmvup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500883/normal_5ff4c11f6d7ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481513/normal_603977421086d.pdfIn PDF document text
    • http://bizbize-yeteriz.org/how_to_use_a_1_8_scale_rulervmjce.pdfIn PDF document text
    • http://myfirstsite.xyz/wisdom_of_solomon_bookdbwno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368756/normal_602edf069ce59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_5fd2a955d3d03.pdfIn PDF document text
    • http://arendaavto.taxi/suwuzemijukubebusujouj8oe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373271/normal_5fffebdd62695.pdfIn PDF document text
    • http://topdouche.xyz/58926369977mr2uf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453142/normal_5fe4c02770f49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491157/normal_5fe938dd0bc33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485704/normal_5fde4908ec425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416504/normal_604b5619b9c50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408593/normal_6002ae5c14835.pdfIn PDF document text
    • http://nowtorrentz.com/relojexajipovejokuxusopippsjru.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/23cb1abc-9441-414e-9d8c-4807606a6761/suzovesopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4f9663-5710-48a1-b4cf-c69a60947bab/how_do_you_celebrate_something_virtually.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af411583-e464-4732-80c4-ec249961474e/36427935443.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_off00012a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 5420 bytes
SHA-256: 95e30b4e2ba550963d9987ac445e60756d07bc5478650622439d45a9751a739a
font_01_sfnt_off00013ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEB 10848 bytes
SHA-256: 0e5ec2d5c25a6d0e94ca2d72e9a94e162a866015d32e9c493550ebb7d2909bd4

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