Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d9a11c8d9f213f…

MALICIOUS

PDF

68.8 KB Created: 2020-12-06 09:36:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1e54955b61e92afb8a34a566d30193f0 SHA-1: 9703518c516f3c16d2d4c8f43d67d7a67afbbe6e SHA-256: 09d9a11c8d9f213f566e2b4b267d01da9ca5dba3cdb1b610fc63aa97b239d745
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The presence of these links suggests an attempt to manipulate search engine results or direct users to potentially malicious content, such as phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://trafftec.ru/aws?utm_term=manualidades+de+oto%25C3%25B1o+con+hojas+secas PDF link annotation
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/d8c22.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/82db18566a127bb.pdfIn PDF document text
    • https://fukobararusi.weebly.com/uploads/1/3/4/4/134404541/dopisutelaw-wojigexipotig-gemiwuj-perebud.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/7e7a39.pdfIn PDF document text
    • https://fenagedel.weebly.com/uploads/1/3/4/3/134316540/vagepig.pdfIn PDF document text
    • https://lupexepiw.weebly.com/uploads/1/3/4/3/134318885/9710673.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/0ae526157ba.pdfIn PDF document text
    • https://kolivobaka.weebly.com/uploads/1/3/4/5/134500933/6208cbbf3560.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/9be6b901-701b-4f4b-bf1d-0aaa93f3122f/59248793114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad803808-724d-4d95-ac56-2afa5f636f49/13016656765.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58178403f5353fdb4c3ff/t/5fcc512b2fa8bc6bcdde1b22/1607225644945/dalurezeredexubewefilajit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/178d6b23-3da4-485c-91e5-4941e1f37998/24869295638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b56cbd39-e856-42fe-b1c8-8e08634e6760/top_tool_brands_for_mechanics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3239f755-464b-4c0b-ab8a-f541da044fb4/rokubifedalaxuwem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f027ab4e-a9d2-4231-89ee-3195ef70fca2/34873992013.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf24e6a371610b87676b1/1606218318746/beputese.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_off0000cd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD04 5224 bytes
SHA-256: 1e1d260aac9cc423760e103a226f54ff0402df2b1113852b6dbb7dec56b48938
font_01_sfnt_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 11500 bytes
SHA-256: 715a49c50caf1faf607d755915ff80d0b57ff48be1664e599212650f893e3529

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