Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6fa0c6839e44a9…

MALICIOUS

PDF

73.4 KB Created: 2020-11-13 07:02:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 743334edcd24b0846c79788360e46a70 SHA-1: d273ec7f9f55cfeafd9706ce57a4972a9cb3dbf0 SHA-256: 8c6fa0c6839e44a9587cd246fe4772f68554a45491379803cdc108a29643a997
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 0.9997

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://traffking.ru/123?utm_term=drawing+basics+and+video+game+art+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413838/normal_5fa0b9afcb90d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_5f9e0effdcbce.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/bazarerin-surilugajexu-jusibut-jopaxig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423454/normal_5faa4eb7dd6e9.pdfIn PDF document text
    • https://vitumiwoz.weebly.com/uploads/1/3/4/6/134697216/803686.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/b8ea8961-0819-45de-8eaf-51d3e2b6aefa/pupodekozafevadilifov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6204c9e-9695-4a66-ab47-befb42b5a6d9/rejowokokaperabufov.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/aztecs_vs_incas_vs_mayans.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/david_escamilla_new_band.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/50885364828.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/diagnosis_bronkiektasis.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/ludido.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/lmia_approval_letter.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_off0000df94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF94 5736 bytes
SHA-256: 1fc83c53c35a7cff5c65cad079c3aba847fa433e74fae05667b9aa3ea10136a2
font_01_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 11048 bytes
SHA-256: 05fd2d908c59f74bb834ddc60f45d8cbbd0449f6ac7fa8d872aa19c7a4915b28

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