Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28d77021fd0e66c…

MALICIOUS

PDF

77.4 KB Created: 2021-03-11 08:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5b9f09955b1f4262dc1046db2a6747b6 SHA-1: 0de2dc946d14b282552c22b2563d06bd836df219 SHA-256: e28d77021fd0e66caa8716a49da7be6704e46268d8b4b51dcb14c8e6a451e2c0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=how+to+have+zero+stomach+fat PDF link annotation
    • https://pabedimulexi.weebly.com/uploads/1/3/1/6/131606760/senozopitiseba.pdfIn PDF document text
    • https://lusimijibujadex.weebly.com/uploads/1/3/4/6/134677052/sizefuvilofavukibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_60488aa81c751.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/mezuxijavemid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376126/normal_5fefe40327fde.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/1cggn3m/gold_farming_wow_bfa_8._2._5.pdfIn PDF document text
    • http://repair-monokoles.ru/wopixeruxudi98o83.pdfIn PDF document text
    • https://bafonalilazuxi.weebly.com/uploads/1/3/4/7/134731076/zuzilux_tuvotatimede.pdfIn PDF document text
    • http://spain50off.info/88428707765kk58v.pdfIn PDF document text
    • https://cdn.sqhk.co/negolura/VibxTjj/bomb_squad_mod_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446045/normal_60414c0a421ff.pdfIn PDF document text
    • http://onlinetiser.website/headphone_amp_dac_android7wz1p.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/Jqhegeq/lit_romance_fiction_books_for_adults.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452193/normal_6021fba3e8427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_60405c2d69a81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1595bfe4-0cc6-4b5e-859d-24d7b3575ee4/58455138210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3edfe48-6261-4aea-a72c-9af6246a95b0/conversion_de_ml_a_gramos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ab0a4bc-34f7-41b6-9a92-67cb48c40786/10644443032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab8318e-0bc6-46e3-9a52-dbde18a6dc05/73855528127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c01759fe-7409-4128-9adf-07800eae918c/sosesaxidab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ea1f7c-829f-4cc1-a67a-18fa09bd11b4/65330778276.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_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 5252 bytes
SHA-256: ef096ee0c30f0d41e8a30af5f78bf38066e8c78513b0cdbbeee962ae2c66aa99
font_01_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 10812 bytes
SHA-256: 61bbcf78e36d9ff4ff598563bfb4041f6a32e722852acb14e43a8b2297136ffa

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