Malicious PDF — malware analysis report

Static analysis result for SHA-256 65632b65cdae7b0d…

MALICIOUS

PDF

82.7 KB Created: 2021-03-30 23:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 642b53e8d59026723860d0a4c19a65dd SHA-1: fc9921830821e9f8ac895703ec26dc8757916dec SHA-256: 65632b65cdae7b0d92371ff5dbdc02b4eeeca110c66bb7a91c86d20edcbd8a3e
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 0.9997

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://leonvi.ru/wix?keyword=return+man+2+riddle+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413011/normal_604472861cdc4.pdfIn PDF document text
    • https://cdn.sqhk.co/mojuzizimu/Cidjbhi/neliropa.pdfIn PDF document text
    • http://folugomobok.getenjoyment.net/82469138553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_60493166be2ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377697/normal_602c3c758b9af.pdfIn PDF document text
    • http://tamekawarol.66ghz.com/lixazupadewuvebemafaxisoj.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/gcjg86X/80438085534.pdfIn PDF document text
    • http://xiwupulo.medianewsonline.com/74957799399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499629/normal_6038df844dd9f.pdfIn PDF document text
    • http://kizezum.22web.org/interior_design_book_free_download.pdfIn PDF document text
    • http://zegobudipaju.mywebcommunity.org/advantages_and_disadvantages_of_technology_essay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_160b336e66904b6489a817a828cc9e9e.pdf?index=trueIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_123a19399e7449bdb643b128b6a5c5a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d11e8ba-9d4e-4a41-8a88-23dc6f4437e2/alex_rider_skeleton_key_graphic_novel.pdfIn PDF document text
    • https://0029a690-d003-4268-bdc7-e74daa5a0415.filesusr.com/ugd/a4b355_08f3cf2483e24ee1b4376f951b1eeebf.pdf?index=trueIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_c8c6794893554418be6a7a9cfa7d83f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/594ed7e6-a41b-4626-b9d4-56292fb6c36f/pojomalatofezevamenapo.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_efdde20c6b274858bd54e2c58f2f841a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/470dafee-e4de-4fd8-bb06-4d9d04f95908/fiwafewune.pdfIn PDF document text
    • http://ladurabazidema.onlinewebshop.net/psychology_facts_about_life.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 5200 bytes
SHA-256: f61c19e5b6e6b77cb33ef782dde6929a1283789e830f73c21c12ac24aa6bdb33
font_01_sfnt_off000109e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 10920 bytes
SHA-256: 384f1a958741177f546b90ce07a58db113a20b2bc739437f7b58aac87f4c546b
font_02_sfnt_off00012f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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