Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4af7e2e4fb7e95…

MALICIOUS

PDF

69.6 KB Created: 2021-04-05 19:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: eda12ec2d0bce1f4708b9bedaf7ac160 SHA-1: 8a61ad8bfa97797a2ccadc70e8d7c0ffb98d4c7e SHA-256: 0a4af7e2e4fb7e959ac62c98f8aeb161efbaf1b0335ac1739e35e3b9b1b09213
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 0.9920

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 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://zajinet.ru/strik?utm_term=solved+examples+of+second+order+derivative PDF link annotation
    • https://cdn.sqhk.co/wufotubi/cQmsmsD/4462888233.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/JageihW/3831819368.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/huhhSmL/79810069008.pdfIn PDF document text
    • https://nikigefewava.weebly.com/uploads/1/3/0/7/130775032/5c22a3.pdfIn PDF document text
    • https://tizirawosow.weebly.com/uploads/1/3/1/4/131483061/tasesur.pdfIn PDF document text
    • https://saximomedu.weebly.com/uploads/1/3/2/7/132740398/fusevufejomin.pdfIn PDF document text
    • https://vevilatibivu.weebly.com/uploads/1/3/6/0/136082609/dekefuripomet-misiji.pdfIn PDF document text
    • https://cdn.sqhk.co/jafiwimeg/ginggWz/business_information_analyst_senior_salary.pdfIn PDF document text
    • https://dolilugufup.weebly.com/uploads/1/3/0/7/130776220/laraxuvodugezi.pdfIn PDF document text
    • https://sewetupowak.weebly.com/uploads/1/3/5/9/135971958/8823145.pdfIn PDF document text
    • https://cdn.sqhk.co/konumapedowe/thbiijU/joker_persona_5_wallpaper_engine.pdfIn PDF document text
    • https://jasefeneg.weebly.com/uploads/1/3/4/4/134489721/3727301.pdfIn PDF document text
    • https://cdn.sqhk.co/mifopanikil/GYhi55d/mowijezizirififodanaripog.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/2810567.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/nogokin.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/8ac3d37c-6fea-40ec-becc-e8402a19d56d/how_to_use_a_convection_microwave_in_an_rv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fababe5-f995-485c-9c23-b204a01d9a2a/13378594806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b5f6087-e1b7-4441-b96d-0acd8a709228/reading_strategies_for_struggling_readers_elementary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e8af5a9-be3a-4d06-a347-5db069825e3e/79230125482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec2c7dc-47a1-4aab-9e23-2c8c6688f170/how_to_hook_up_bose_speakers_to_onkyo_receiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4532afe-ee2d-4935-88b1-2a938d94a13e/49203281406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a5d3eca-48fc-4f14-8aaf-e5f20be3f38d/gmat_study_schedule_2_months.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_off00010201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 5532 bytes
SHA-256: 04adbdc4386c548689edae5cd03e97d5e3a51cca6a2ed602cb7f7bba882262fd

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