Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa686d186a63f96…

MALICIOUS

PDF

80.6 KB Created: 2021-02-26 00:21:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8d65b3ee20da946f90007b6b5414157a SHA-1: 2f1d24404efa99d3beb023dbc84a1f8026fb898a SHA-256: 4fa686d186a63f962ebfc4bdf7f225592dac5fd6720a78b900c17b17dadf6d2d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or suspicious platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=united+colors+of+benetton+perfume+green PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379959/normal_5fe52b32db9a6.pdfIn PDF document text
    • http://menformula.xyz/43913113101befg3.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/3529386.pdfIn PDF document text
    • https://tukadivi.weebly.com/uploads/1/3/2/6/132695248/nedux_vunel_gozajipiwuvew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443325/normal_6001022b845f4.pdfIn PDF document text
    • https://welokanuxutumo.weebly.com/uploads/1/3/4/0/134017703/rovede.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484107/normal_6006513718528.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/the_sims_3_generation_serial_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490366/normal_6018a2afde9aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379969/normal_601b27dfefaaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450733/normal_5fe7248147bd1.pdfIn PDF document text
    • https://zuzivosojix.weebly.com/uploads/1/3/0/7/130775151/situvitejilez.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/fizaxo/american_red_cross_cpr_training_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/nutrition_information_3_oz_cooked_chicken_breast.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/baixar_snaptube_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/garoja.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_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 5396 bytes
SHA-256: 22ac0a684c6c0e38c8d8fe9e952441eb7f76f079bc0b52014640720f72fe2ff3
font_01_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 15304 bytes
SHA-256: d8fd2be798e6cbdb86d102cb47ad6117c29005a6938f2a882b439b341faa0643

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