Malicious PDF — malware analysis report

Static analysis result for SHA-256 57735b38e89423d2…

MALICIOUS

PDF

63.8 KB Created: 2021-06-05 02:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 661d2934c030581761cd80c12311fbb2 SHA-1: 0512377a33be2f4b3737168f5c930fe7b8224711 SHA-256: 57735b38e89423d2a0b9fd6ebf78ce25d2c7ab6f0806f03ec345e9fae2513bd4
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.9487

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 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
  • 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://krisoc.ru/pbw?utm_term=what+is+prometric+exam+for+nurses PDF link annotation
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/jaboriviv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_6050d8c366ce7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385204/normal_604a13c4a4e6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458144/normal_6008d125f313d.pdfIn PDF document text
    • https://wigitofeza.weebly.com/uploads/1/3/2/6/132682623/9487031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498842/normal_603c7b3351899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423133/normal_5fd8c01b8ca6d.pdfIn PDF document text
    • https://denalozi.weebly.com/uploads/1/3/0/7/130776502/7428980.pdfIn PDF document text
    • https://gesunujas.weebly.com/uploads/1/3/4/5/134509411/5807398.pdfIn PDF document text
    • https://wexejapu.weebly.com/uploads/1/3/1/3/131384175/d2db50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_5fd3b434277b3.pdfIn PDF document text
    • https://jivimukik.weebly.com/uploads/1/3/0/7/130775904/1414777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_6040ebd120631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387704/normal_600e89fabd1a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428061/normal_5ff19195e9b07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467318/normal_60527a4da4eaa.pdfIn PDF document text
    • https://vopenunajobip.weebly.com/uploads/1/3/2/3/132302870/2a90243a246c.pdfIn PDF document text
    • https://kogozodibivuf.weebly.com/uploads/1/3/6/0/136094397/5860447.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/1e1f2f5c-a8a5-4fbb-a190-5a0692f47726/2007_jeep_grand_cherokee_srt8_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/555ca3d7-c267-481b-b0be-60db5240a576/what_town_is_little_house_on_the_prairie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bca68401-07ba-456d-9eb6-2838adf683eb/one_call_away_ukulele_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d5936a-6cad-4519-9d18-7e2a7d29ae4d/line_plot_worksheets_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c98c17d8-aa79-45c0-921b-d045131b5c80/13207201099.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 5304 bytes
SHA-256: 6cc4ab8512bb91f2fa6fa14047cd5570a103e0a4d0c5f40b6b6e7731bfad46e8

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