Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09e1aa49327f8cc…

MALICIOUS

PDF

75.1 KB Created: 2021-03-08 09:33:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 36e76307a3dbadb61234915f0f019a2b SHA-1: 3c07d73ce9073dfbf40577a0cf62e5a16188c749 SHA-256: d09e1aa49327f8cce0b99abc9b998584f1f86c052b2582cf33e3637376d74f97
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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+insert+the+keurig+water+filter PDF link annotation
    • https://cdn.sqhk.co/digijodaga/iZgejaC/siren_head_colouring_pictures.pdfIn PDF document text
    • http://muvibigi.22web.org/gemini_alarm_system_low_battery_e02-00_service.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_6019f0b0236bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449622/normal_5feb665ccad45.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/gcucjeg/51239431653.pdfIn PDF document text
    • http://kurekarer.22web.org/auto_weather_update_app_android.pdfIn PDF document text
    • https://vidimepimexuja.weebly.com/uploads/1/3/4/6/134626803/tafirug.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/8158881.pdfIn PDF document text
    • https://jomokojexenubi.weebly.com/uploads/1/3/4/8/134877089/9ca368f676fa41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_602e30cf06c5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_60319972e317a.pdfIn PDF document text
    • https://vesanalu.weebly.com/uploads/1/3/1/4/131482823/d374b3a7800865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462036/normal_60354c93e376c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485446/normal_600774a0a54ea.pdfIn PDF document text
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/kutiwajadosig_risanib_dibenopir_gatexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wefasinufatotag.epizy.com/estoppel_letter_template_free.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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 5144 bytes
SHA-256: d9d64edffc367f605c41033fee2389c7bb5abb573cf0e789b1a15001ed73582d
font_01_sfnt_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 11024 bytes
SHA-256: c384174ddf6b7806f1fdaea90eef6d853a9a05442de01ba9b3d8e22ddb45079a

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