Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b950af4f34a268…

MALICIOUS

PDF

78.0 KB Created: 2021-04-23 09:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d2df2fc2db5697ba5c97434b19256687 SHA-1: 77cca55b40cb7937b0a9a73e78e175a098241d81 SHA-256: d9b950af4f34a268fba237c4c05ada4807e7c1471336023bb3c85a0740817e96
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to legal or financial documents, which is a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://maypoin.ru/strik?utm_term=contrato+de+arrendamiento+formato+minerva+pdf PDF link annotation
    • http://donbetosstreettacos.com/mutusuzinidenelitufejatla40n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_601cedcbebd3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467571/normal_6011d1f5d83e1.pdfIn PDF document text
    • http://mikrotikwizard.com/netflix_movies_2020_fifty_shades_of_greyx71dc.pdfIn PDF document text
    • http://covid-19online.site/concepto_de_textura_en_artes_visualesyxkhr.pdfIn PDF document text
    • http://i-men.ru/which_multivariate_analysis_to_use6kwm1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406806/normal_5fcd0f7c0161b.pdfIn PDF document text
    • http://gtomishebs.xyz/solution_set_notation_interval6m996.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422373/normal_5fdefba8cd952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450257/normal_6068c1e1df79d.pdfIn PDF document text
    • https://cdn.sqhk.co/lomokubaf/hb8wQgd/heart_rate_monitor_app_for_iphone_8.pdfIn PDF document text
    • http://disconto50.pro/the_land_of_stories_the_wishing_spell_audiobook_free3rxc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408588/normal_5fcda1c822ab6.pdfIn PDF document text
    • http://abzac.me/911901950553cgzx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451757/normal_604a883e932e3.pdfIn PDF document text
    • https://cdn.sqhk.co/wenoxavawo/hfoejcP/ranukofupikuwimewivivap.pdfIn PDF document text
    • https://cdn.sqhk.co/powitaxixu/d6jegjW/personal_biodata_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415331/normal_60050d4a771c4.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/idmibAl/rfid_tag_finder_apk.pdfIn PDF document text
    • http://kprovk.xyz/55242870579vjm42.pdfIn PDF document text
    • https://cdn.sqhk.co/kurazagizub/aD1jfjb/96024668086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456135/normal_601f272b2d6ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_601dd0b787a55.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/xjh3jcl/84402107642.pdfIn PDF document text
    • http://organic100.fun/janapada_geethalu_freetl3gl.pdfIn PDF document text
    • https://cdn.sqhk.co/bopibege/iaLchcL/12641829840.pdfIn PDF document text
    • https://cdn.sqhk.co/taxosavasesa/jgAgjgg/71800438728.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000e00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 4944 bytes
SHA-256: 767a406ee19881ee670e7ead1e4d54d572469ad538a431c33d99b7d1aa6204cb
font_02_sfnt_off000101ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 12016 bytes
SHA-256: 78d04c10dce7643d5c7329cbbe8bfa7d8250e3759c5d619ceedcebd6900b6fd4