Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf846341896e124…

MALICIOUS

PDF

85.9 KB Created: 2020-11-30 06:12:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8f4ffe777c9c731311fe5962ec4414c1 SHA-1: 904e71d1c041755a28404d4843dce23234571dc3 SHA-256: 0bf846341896e1242bb535e5eee1f5c4173ffe8333005310e17ee4478fbeac0d
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/strik?utm_term=dr+spock+baby+book+pdf PDF link annotation
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/danuga.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/2748195.pdfIn PDF document text
    • https://dudumudisedaj.weebly.com/uploads/1/3/4/5/134591614/4802243.pdfIn PDF document text
    • https://rekenapun.weebly.com/uploads/1/3/4/8/134851377/8fbe01a.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/190fbb2a57f.pdfIn PDF document text
    • https://vizomitula.weebly.com/uploads/1/3/4/2/134266598/5126278.pdfIn PDF document text
    • https://majemuxisirilud.weebly.com/uploads/1/3/4/7/134719568/sorirarejapumon.pdfIn PDF document text
    • https://wazeketarawowaw.weebly.com/uploads/1/3/4/5/134587567/801bd.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/davolazupivowi/juxazapojuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25cefbb-db9f-47ac-91c9-4ce4fcdd51d4/togasira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3533b34-d01e-412a-b7be-2f8c80027338/dadonaxivufifegerebepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ad11129-4e32-4408-8dd5-1c76ff04f875/rojebopofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80a573ac-728a-40dd-a6fb-a25fa3a2d643/dj_pro_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/280c1331-e7a0-4414-bcb2-2c4cf53e7b60/75312222146.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/first_worksheets_printable.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_off000112c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 5424 bytes
SHA-256: ec0bc842bfce3178bfb7e57680460c6743c37025ff8af3b350363444dbb9b769
font_01_sfnt_off00012557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 11004 bytes
SHA-256: 842b9a0f3fb0880f3d85b150d47f04dd6e4824c755b87f225c6ace8f0132fa8d

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