Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8a78afe88a930c…

MALICIOUS

PDF

65.6 KB Created: 2020-11-14 14:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b0dcd91678351655216e1406107d2102 SHA-1: 160658b5ef8e70815522a5565f99c88a4f0ca5de SHA-256: 7a8a78afe88a930c2aa139dd6e022e424a69e07243a5372e945904292a37482a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 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.
  • 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/strik?utm_term=jungle+blad+skriv+ut PDF link annotation
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/gimopikeka-sinopetugafurug.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/8ce4384d566a.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/gewuwasi/kifofubepeniwegexawo.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/lutawokuluvufugopomu.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/33894288428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa853966-4a4b-4c1a-86c4-cce422ab55df/73126759402.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/academic_writing_structure.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/career_word_search_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/69550938873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a3679e7-11b3-4a25-8e9d-b33b48091993/30701011701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/953d46dc-f7f7-45b0-b5ce-6e7b9c137e2e/67259891855.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/cassandra_skill_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3818a85d-5e0c-403d-8243-a5246f0977d3/resumen_de_la_pelicula_los_piratas_d.pdfIn PDF document text
    • https://s3.amazonaws.com/juxatop/59936785518.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/67535634927.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_off0000c349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC349 5244 bytes
SHA-256: 90ac57fcfadf9574b0509189d2fb3adf5eabb939787877bcbf1f26f8dd4b3082
font_01_sfnt_off0000d534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD534 10824 bytes
SHA-256: 6583774439a9efd74043b8e1a7f22228a4a5109730fd388a7e7ee423a22a0b67

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