Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5154261ab9bb85…

MALICIOUS

PDF

90.6 KB Created: 2021-03-18 12:23:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7de5db25dda51b8bfa87034dd79860d8 SHA-1: 212864764a20b4e7678bb99f8269266e3a08216d SHA-256: bd5154261ab9bb85bbbfd4c56fdc00cd0d53608d2436bf85765157bd218cdd12
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 0.9998

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://jacksth.ru/strik?utm_term=best+free+apps+to+learn+arabic+ios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458616/normal_60142d0779bc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530070/normal_60065c5089418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_600b452012443.pdfIn PDF document text
    • https://vinosubolab.weebly.com/uploads/1/3/5/3/135316207/fixagopanipuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456391/normal_604176077cb9c.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/duteti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxexi/tivetisakasesinoburimun.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_556ef2bb2bcd4a21bdbcdbe0c9d8debd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxunaf/85583689374.pdfIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_4347a92d548c4d58b401badec0c3c0ce.pdf?index=trueIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_7372d0be3eb94ad08ce93687d4042a35.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b4d0f77-876b-4238-8710-d960ba7af8dc/what_time_does_stock_market_open_and_close_in_california.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/quiz_games_app.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/37165605556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eec0daf6-b8c3-4bb3-a408-8829d0997a45/41515578009.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_a1c26c0d4231485c9a26f0f963c7cd67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/498e82ab-168d-4059-a902-362cbb01a703/vutawazigisiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9269d745-5c68-4e6b-a4c8-09882f462538/beriponupovelivip.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/grievance_registration_form.pdfIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_593d3126bef1442194c6da598fc072df.pdf?index=trueIn 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_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 5200 bytes
SHA-256: a8ba1e63649285bcd48d7a4ec58ec4b682c96d57f5c559d25f28bcff5c31eaeb
font_01_sfnt_off00013542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13542 11356 bytes
SHA-256: bbd6601405a9b5872fe3420e9bb80c0ef5ac670025d6bceb942135ad4c4f652c

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