Malicious PDF — malware analysis report

Static analysis result for SHA-256 7270c63129e860cd…

MALICIOUS

PDF

82.4 KB Created: 2021-03-18 01:26:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc524c436b253c19d36583025029f3cb SHA-1: 26133d59693773b394d5539da1e25ec8b7d52a31 SHA-256: 7270c63129e860cde0237e6ab26585f3217a7f77c00ead6f06aa29bc11ee50bc
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, specifically employing a browser extension installation pretext to deceive users. The presence of numerous external links, many hosted on disposable domains, suggests a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of the user's trust to download further payloads or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/wix?keyword=romeo+and+juliet+figurative+language+act+4
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/nekolonezetil.pdf
    • https://fejuzewe.weebly.com/uploads/1/3/4/8/134883228/8ab48651.pdf
    • https://cdn-cms.f-static.net/uploads/4401517/normal_602caad0d9e89.pdf
    • http://vykupavto54.ru/simple_rental_lease_agreement_form_freezs1tk.pdf
    • https://redewude.weebly.com/uploads/1/3/1/3/131379671/9024483.pdf
    • http://wodedutipif.medianewsonline.com/asme_section_viii_division_1_2020.pdf
    • https://vixawesomuwevu.weebly.com/uploads/1/3/5/3/135387162/lifiguzafeb.pdf
    • https://cdn.sqhk.co/lejesapazud/GFjjcjc/pevaxememabetunilafan.pdf
    • https://cdn.sqhk.co/xusarukave/eD2icjd/39077868221.pdf
    • http://importants.space/arachnid_dart_board_replacement_partsxlnqp.pdf
    • http://kismykeitio.best/marie_lu_legend_movielradn.pdf
    • https://static.s123-cdn-static.com/uploads/4505326/normal_5fe3a53ac3584.pdf
    • http://prechambre.xyz/duxupisofuruvolefepej5oxxz.pdf
    • https://xasuzetevoke.weebly.com/uploads/1/3/2/6/132681443/lebisodumigem.pdf
    • http://it50off.pro/3653451288guk06.pdf
    • http://visetazide.medianewsonline.com/73665944994.pdf
    • https://cdn-cms.f-static.net/uploads/4422897/normal_5fdc47c8cb7b6.pdf
    • https://cdn-cms.f-static.net/uploads/4427097/normal_6032b0c5d7d44.pdf
    • https://zitenimed.weebly.com/uploads/1/3/1/3/131383388/vusuzemelibegopon.pdf
    • https://jumuvive.weebly.com/uploads/1/3/0/7/130776409/7671016.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://biwosagamivi.myartsonline.com/vezefifofumifej.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100de.bin
0e74e307a5aaccce665b3ec90f08fe2c87e1a881ddf406cf890e2189345dd1dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 5392 bytes
font_01_sfnt_off0001133f.bin
7a97f573ca6c501c705bf749d3ae6f22bf949e94dd3b4305093a37499396a207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1133F 12032 bytes

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