Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15696229faa3b2c…

MALICIOUS

PDF

58.0 KB Created: 2020-12-21 05:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ff00c8c7fd86551f6848871e9d6240b9 SHA-1: 840022f517207c06fd7e55e55834fe394ce28829 SHA-256: c15696229faa3b2c52eeed62cbc5ef4ca0e4bd1e5cfa844b68e3c9d268a5b643
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs points to the document's primary function of redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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=block+puzzle+free+1010 PDF link annotation
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/safabajokoneb-pufaxotumokaz.pdfIn PDF document text
    • https://fubexomufepa.weebly.com/uploads/1/3/4/8/134850999/sametalebom.pdfIn PDF document text
    • https://jobipidamefoji.weebly.com/uploads/1/3/4/6/134696246/4116811.pdfIn PDF document text
    • https://kisigitoteke.weebly.com/uploads/1/3/3/9/133997396/mumewab.pdfIn PDF document text
    • https://kakejomoweva.weebly.com/uploads/1/3/4/6/134674311/kuwanumubuma.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/dazuxujepov/archery_master_3d_hacked_version_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d5d35e-512f-4b9a-b7ed-53e781171327/92363628130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f93afa43-1a4f-4714-a2a0-0e86b7c5d089/51990365310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/256e2843-d6de-4bc5-a23b-8942e27bf342/dime_unidad_4_leccion_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/benzimidazole_derivatives.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/phagocytosis_is_a_form_of_endocytosis.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_off0000a9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9C0 4976 bytes
SHA-256: ba1647537e1225778f6520e77fa54838a85596fd1532b76c1e6b1cd750d27a0a
font_01_sfnt_off0000bae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE0 9424 bytes
SHA-256: 12f88c5c427e6689be3ebcee07dc842bcabd63ca43ebc4554336b1bf88ab919e

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