Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21fd8e7b01d7b04…

MALICIOUS

PDF

62.7 KB Created: 2020-12-22 08:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cf5f16540a0a724fb88468ae42422888 SHA-1: e7a9b346b534d463a2d71381d04004c98616f0a2 SHA-256: d21fd8e7b01d7b04ca54dad9cf7749e79f82f9a0fd22adc6e33126030efbd7c3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, disguised as a color chart, which is a common tactic for link farms and phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates the presence of numerous external links, with one pointing to 'https://s3.amazonaws.com/lanubili/zajini.pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://traffine.ru/123?utm_term=peaches+and+cream+yarn+color+chart PDF link annotation
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/3136970.pdfIn PDF document text
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/4356457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_5fb47884880cb.pdfIn PDF document text
    • https://palidabelegofa.weebly.com/uploads/1/3/4/3/134316445/kitanisisekafi.pdfIn PDF document text
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/zajitufiwako.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/lanubili/zajini.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/banking_service_chronicle_january_2019_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4c6fcb-a36a-4eeb-a835-78d2fbbe6622/zorovababulugezugiwinozaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f91926-72a4-4533-9cba-f0695cd65155/auto_chess_guide_dota_2.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/73304478560.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6a9dc8139af03766d2bb0/t/5fcb8ccd6fd93023bc0701fa/1607175374631/gixaviz.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/last_war_of_the_world-island.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_off0000b689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB689 5280 bytes
SHA-256: 8a602b31c3530ddc0581c7db04fa38f87c1f82d792683d66a2aef1237c949ba5
font_01_sfnt_off0000c854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC854 11460 bytes
SHA-256: 59de8c3dcbbf76ddb943be78c6a7fe38222583338c17a0e3bd5b28cdaa267ffb

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