Malicious PDF — malware analysis report

Static analysis result for SHA-256 df82c75d872b072d…

MALICIOUS

PDF

68.2 KB Created: 2020-11-16 19:23:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: addc30f8f53ca787590d2ae23e58d6a3 SHA-1: dc1099862e986111cda0e86185c481401e842644 SHA-256: df82c75d872b072d6dbe38efe4505b1d0f4efd4f21eada23b3cea026a526e60f
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://trafffi.ru/strik?utm_term=cavernous+transformation+of+portal+vein+radiopaedia PDF link annotation
    • https://dukutisanag.weebly.com/uploads/1/3/4/3/134318107/9437126.pdfIn PDF document text
    • https://bimidupixujeg.weebly.com/uploads/1/3/4/3/134319160/vuxarireb.pdfIn PDF document text
    • https://kipamafulu.weebly.com/uploads/1/3/4/5/134588126/riripesipatolesan.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/65969232af4.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/f812834d1.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/nazekisigiduz/activity_1.3_1_solar_hydrogen_system_vex_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/4846279950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9662c7-8988-44f5-9ad9-e753f62296b3/95166206790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34841ab1-8032-450f-b362-c1880d8f77a3/17790028560.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/34419963555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad2c8aa-ab9b-40ce-aca9-45d21338d4ee/52772998659.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/the_unknowns_band.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246fcf50-a171-4d37-abdd-11bbf4041c3e/altimetria_topografia_exercicios_resolvidos.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/39807961569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79116469-6f90-4304-aec5-d4c95f2700ef/34039212435.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/the_three_musketeers_by_alexandre_dumas_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/59409139786.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_off0000cdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFF 5152 bytes
SHA-256: fb9898370ea59ab73e7190e4d0b4fe128218667058797ae7f1f20a1549ff0c53
font_01_sfnt_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 10684 bytes
SHA-256: df3e964d9548c1830b4c5c2b54d670f78249bd772a7825f458c6170b254d595c

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