Malicious PDF — malware analysis report

Static analysis result for SHA-256 54972a46d33fa19c…

MALICIOUS

PDF

65.6 KB Created: 2020-12-20 12:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f85fa4a5ad0dab13e0a4213fc0a6f554 SHA-1: 937176b0c270ddd2f51086b16da5293acea3d974 SHA-256: 54972a46d33fa19c624acb69a46cd18e434e8bd673c054b453adcfaf37a75323
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://traffine.ru/strik?utm_term=the+seafarer+study+guide+answers PDF link annotation
    • https://rigokapine.weebly.com/uploads/1/3/4/5/134593974/cf8f9a120a5db.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/tukuxuwutaxopaw.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/9d22fd00-ec25-49a6-8ebf-8fa7d5ac8cae/inglorious_bastards_movie_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42bda4a6-3dfd-425c-b250-81de79a07d99/58289021523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/141b942a-bd66-45c6-98b8-2fcc8bdd55f7/nunafevujedotumimarajeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d680334-0a1c-4550-a471-440d6076a9ab/jevusibopakogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea70f650-7e0c-4ca1-a4a2-b2e51e4b0e7b/suwegatovezoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6553f2c5-5751-4976-9c97-21b11c92531d/zujapamefomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d18750-2ae6-49d5-a680-af99e00d355b/tazekuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9306ca67-aafa-4dde-be20-906d40856433/pagosawevofetejujonof.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcab432373c863b887b4f8/t/5fdd0e4cbbbe9330762295f7/1608322636997/jujiroxogikavuzudepixeb.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/ligaborifuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3416e17d-ef85-4e7b-9a7a-79fea42b368a/outcast_second_contact.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460ad434-0e74-4052-911e-289c98776422/57825075468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ca4988-b82c-49ee-96e3-4b852373b026/35002677278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c38858ed-3d4f-48ee-9ed6-076709e18382/94671869179.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/apush_period_1_term_review_answers.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_off0000c688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC688 5280 bytes
SHA-256: 2d05ba3511c23da701ca5c7e8065b4cf4a6f54db852e9e0a2ab42e45cd6bdae1
font_01_sfnt_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 9644 bytes
SHA-256: eb748c0f2e8c0459a4586b4bf9edeea13d6f2b4b76c2854d41779b0d3ab777d7

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