Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c40fbdc856f123…

MALICIOUS

PDF

79.1 KB Created: 2021-03-01 01:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1d199ba824a189e62852bd108a7e5e30 SHA-1: 7f7294a9d07a39363222d97a8997c44ab884963e SHA-256: 36c40fbdc856f123390e7b1d5040a7c28edec6423296d5b60929a98af08c3061
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of such domains for potentially malicious purposes. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

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://botokaw.ru/award?keyword=python+programming+language+tutorial+pdf+download PDF link annotation
    • http://nuloriwilorij.scienceontheweb.net/purisomedolepopatu.pdfIn PDF document text
    • https://simepatu.weebly.com/uploads/1/3/4/2/134267103/75d1bc9d949e0.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/19023275013.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/kosesaxomomi.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/v_wie_vendetta_trailer_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445337/normal_5ff4ecad05f03.pdfIn PDF document text
    • https://xexigajusotojuz.weebly.com/uploads/1/3/1/6/131606060/bokulolesewoxixu.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/PghFk9D/24835271441.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/jofotiliwesajivu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391008/normal_5fd03e3906c34.pdfIn PDF document text
    • https://cdn.sqhk.co/madobeborozu/hehbbXC/calendar_2021_template_ai.pdfIn PDF document text
    • https://vaviwajefumizin.weebly.com/uploads/1/3/5/3/135348181/liwubifud_tivakufovon_nexilukizasete_zevete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_6014b972f24fd.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://redifigikutusoj.myartsonline.com/95022187189.pdfIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/defapuketulene.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/class_11_physics_formula_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 5356 bytes
SHA-256: 729fe24111ccc3cc607f94b9bd1119b063369d256602977c795514c8ca358a40
font_01_sfnt_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 10984 bytes
SHA-256: 4a7d8e8260c8d45081887ed31697a9cfef5743d2411283d834fb683134a56f67
font_02_sfnt_off000120e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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