Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f9104a4e8786e8…

MALICIOUS

PDF

80.1 KB Created: 2021-06-10 21:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 75941ed6db9b85d18cc6b6e43b9ed5da SHA-1: 0b9e567a2b80fee2977e62cb6e0d27bcf54e5a5f SHA-256: b2f9104a4e8786e8b4422b2df9a03d3e121be12047ea0e8117dfa0de36d4a778
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://crewmak.ru/pbw?utm_term=rescatando+al+soldado+perez+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450898/normal_5fda6fe77f68f.pdfIn PDF document text
    • https://rogofimek.weebly.com/uploads/1/3/3/9/133997266/96f52a42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415308/normal_5ff714d8bfa5e.pdfIn PDF document text
    • https://dirujewe.weebly.com/uploads/1/3/4/6/134677456/fukoxuxeduzaviwa.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4495526/normal_60b73b242f6db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481420/normal_601637a009a60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144566913/how_to_look_after_my_terrarium.pdfIn PDF document text
    • http://tuxafivimit.pbworks.com/w/file/fetch/144879282/download_abc_song_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed84a963-648f-420c-abfe-ab5766665671/a_static_budget_report_is_appropriate_for_quizlet.pdfIn PDF document text
    • http://fevosezew.pbworks.com/f/77380854211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28597953-263d-45f0-8ee3-e798b65c6f7a/ford_4500_backhoe_problems.pdfIn PDF document text
    • http://viforepolu.pbworks.com/w/file/fetch/144944640/17509658511.pdfIn PDF document text
    • http://xefobukeza.pbworks.com/w/file/fetch/144599904/conversation_between_two_friends_while_shopping.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144425085/27899630881.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/w/file/fetch/144631119/29592465536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f415da0-8cf2-46aa-9890-43042751f424/singer_heavy_duty_sewing_machine_bobbin_problems.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/w/file/fetch/144505449/nakazatuvemelutixapis.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/w/file/fetch/144585546/8.pdfIn PDF document text
    • http://kutegazez.pbworks.com/f/perezefo.pdfIn PDF document text
    • http://zexowisam.pbworks.com/w/file/fetch/144427122/where_do_you_put_the_suffix_on_a_passport_application.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_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 5124 bytes
SHA-256: 0380217c2a86f92b885780c8de4d76a3f2fd0d93af475239174887cfb109edfb
font_01_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 14804 bytes
SHA-256: d0b631db9a4e7a225c1fde86c84415d6c925f0f0e6a4566c0a1b88b5686a323f

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