Malicious PDF — malware analysis report

Static analysis result for SHA-256 72de8a679f59b3a9…

MALICIOUS

PDF

72.7 KB Created: 2021-03-26 08:36:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d653be53ab339c6f565f09055128318f SHA-1: ebddfd1faab08358f935f80df4497a31ef42b90b SHA-256: 72de8a679f59b3a95632a3273d7d797a605b9efad5254a3d92c96a73f942a074
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging T1059.007 if JavaScript was present but not extracted, or T1566.001 for its delivery.

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://botokaw.ru/strik?utm_term=wagner+paint+crew+plus+roller PDF link annotation
    • https://cdn.sqhk.co/gopilufifeda/hiijjdv/best_mud_and_snow_tires_for_atv.pdfIn PDF document text
    • http://gifozuxozud.22web.org/pemagonobofulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500001/normal_6048eecb47794.pdfIn PDF document text
    • http://bapadama.medianewsonline.com/exercicios_analise_sintatica_concurso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446642/normal_602b63aed8821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501998/normal_5fc5cc532ff5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453100/normal_600ce82015a35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418001/normal_5fed4e0a4b4c4.pdfIn PDF document text
    • http://mereritijazos.scienceontheweb.net/centre_of_gravity_and_centroid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453537/normal_5fe388cc9f316.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvajuvewuj/eephdje/best_world_war_iii_movies.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/doodle_god_hd_free_apk.pdfIn PDF document text
    • http://fidalanono.myartsonline.com/tosal.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/fe_exam_texas_locations.pdfIn PDF document text
    • http://sukifimogu.rf.gd/jabixe.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/54557237516.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/laganesoniv.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/dating_couples_bible_study_plan.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_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 5208 bytes
SHA-256: 763bbf1149691c98366a026c8f0c1443d1d00edca8dae2f3bbf64786afe84cbf
font_01_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 10688 bytes
SHA-256: 09090284bdcac1bcc589f21ca6ca19deb1560aa91f0c8015725af78441dc01a3

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