Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd53f65595c4a2d…

MALICIOUS

PDF

99.1 KB Created: 2021-05-12 21:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 63877fef0c234b11280294376704adf6 SHA-1: a3e13bc85d4decb88dbfe18fdee3f521ae3a4291 SHA-256: 3dd53f65595c4a2d7319de4aca1c8f28e7d1327d5d0618f7cec1b8f6e92da07c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/strik?utm_term=best+solvent+for+recrystallization+of+naphthalene PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501656/normal_60699dcfabe64.pdfIn PDF document text
    • https://doxekitonibi.weebly.com/uploads/1/3/5/3/135326555/kemovaziber.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_603c07ce69a55.pdfIn PDF document text
    • https://bituxomixa.weebly.com/uploads/1/3/4/1/134131270/semavugaditadevak.pdfIn PDF document text
    • https://xalonekeroritaw.weebly.com/uploads/1/3/5/3/135329664/1456819.pdfIn PDF document text
    • http://sesulede.iblogger.org/financial_risk_management_strategies.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489993/normal_5fdf6da04fd9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499995/normal_6040f6187f0f5.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
    • http://wapugabidojako.rf.gd/widaguluxufogo.pdfIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_b33bd0c6b28d4f32877af90d4d9a9a3b.pdf?index=trueIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_d71e36f95db84b5f9dbe65950bcd7ed0.pdf?index=trueIn PDF document text
    • http://gavawekib.myartsonline.com/44088192558.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/articulo_4_dela_constitucion_mexicana_de_la_salud.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/batman_arkham_origins_app_free.pdfIn PDF document text
    • http://dubebexo.epizy.com/c_o_c_magic_hack_game.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/guzonatitog.pdfIn PDF document text
    • http://jorasixu.myartsonline.com/zewubujira.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/ziwenojilexiludur.pdfIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_ba985de7136243cd94fdcd11f906d761.pdf?index=trueIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_a4d140db75f74aa18532ef390bb06b40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiduro/equality_and_diversity_worksheets.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_5bed14f506c5432ab87210bf614f701c.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D3 5152 bytes
SHA-256: ada683af1467e42c4fef88a7a5fba02055a574361f395e35a8e3a34bd09ffecd
font_01_sfnt_off00013461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13461 11180 bytes
SHA-256: e657be6bd6e8c3a4d57221d1f97d68958f9df0b06299fd1b0a3a503a3523f5d6
font_02_sfnt_off00015a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9C 16260 bytes
SHA-256: b1b93bf558ee65cf174bdde98fc70b39c77ddcfeef9d3a00758a58eb2f24951c
font_03_sfnt_off00017011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17011 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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