Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cde2aaa5d260a4…

MALICIOUS

PDF

71.1 KB Created: 2020-11-10 17:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: daddd55d3c3eed31775cfd4ed652d82b SHA-1: de00ad8b7f770ffbf3e67233694866137b711982 SHA-256: 75cde2aaa5d260a44cb0cf406a81d85da059628374498a0834a5adec0f19ef3c
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://trafffe.ru/123?keyword=epi+medical+term PDF link annotation
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/bosilo_ginasesif.pdfIn PDF document text
    • https://jedotulaxadetin.weebly.com/uploads/1/3/4/5/134587896/9537cf5c.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/zemapatefi_gukok_zeram.pdfIn PDF document text
    • https://pimupaxepa.weebly.com/uploads/1/3/1/8/131857198/maduvavazagexuvigo.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/9244072.pdfIn PDF document text
    • https://bimuxafidiw.weebly.com/uploads/1/3/4/7/134701061/3422015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/davolazupivowi/student_teaching_reflection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a783fd5-7899-4fbf-97b5-c2c2381cf3e8/volver_con_el_andres_cazares_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb10403-81ae-4c9f-8bd5-02b245a2cf2f/13600613155.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/30277963293.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/96896261426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58d4937-3d01-4b10-b28b-f529ed363df1/nuseto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b93a413-0ec9-4bb8-9aef-6572951d756d/32341179168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/542d436a-0a45-49f8-9c81-68df6b544e91/58574775056.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF06 4568 bytes
SHA-256: 7077c88f949096177dd787cbedf49964ad2652ddc3e384407f06b18ac2f913ae
font_01_sfnt_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 10356 bytes
SHA-256: d45cad4e39fd38a4f0ee72bc664c06d7e2bdb4bf8f0140f041f04e5a8e94f3a7
font_02_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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