Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07af0ca2ecde78b…

MALICIOUS

PDF

70.8 KB Created: 2021-03-19 03:25:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6171ab2a0a0f997ee60eaac8cae8c3d0 SHA-1: 9d95818ea2d3149eba79e74a8b774d78e4c72627 SHA-256: c07af0ca2ecde78b935e5bd936746f1538e3633b7bd52b8d185b614699c83165
186 Risk Score

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-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.
  • 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://botokaw.ru/award?keyword=o+level+mathematics+notes+pdf PDF link annotation
    • https://faxuritenorajap.weebly.com/uploads/1/3/4/5/134585079/d7dba5db5e46.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/sutogagoj.pdfIn PDF document text
    • https://cdn.sqhk.co/fewesiwe/cmshege/a5_booklet_template_word_2013.pdfIn PDF document text
    • https://jewanulak.weebly.com/uploads/1/3/4/3/134305347/jaxawafotez.pdfIn PDF document text
    • https://cdn.sqhk.co/piwizogir/fBiiJge/80858034815.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/8161864.pdfIn PDF document text
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/5bc0fda8e4.pdfIn PDF document text
    • https://xokefinodoju.weebly.com/uploads/1/3/5/3/135316617/sinewugisosug_ravajefis.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/vnsgu_bcom_books_gujarati.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_dc3a591bb85c4185b5e797bbb34219d3.pdf?index=trueIn PDF document text
    • https://b1a3a363-0690-49f7-9fdb-0cf2a37422ae.filesusr.com/ugd/f34823_0b6d551fae4941d59fea25fb0cfe23f9.pdf?index=trueIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_534ff091671943d785eba40bfe555489.pdf?index=trueIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_9df0f3101cf44a9584bb19cd77242ba6.pdf?index=trueIn PDF document text
    • https://c9977776-9e37-4432-9eae-e541147807da.filesusr.com/ugd/bb6cc6_2b0087be5d234ecb8b441ea224c4c0c6.pdf?index=trueIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_03f035df4c6849338a4d03fbc0fb73dd.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_536a0346a1184086a06a4efdf6f640a9.pdf?index=trueIn PDF document text
    • http://pujumek.myartsonline.com/agile_methodology_in_testing_with_example.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_off0000d8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 5388 bytes
SHA-256: 4931d915e63210e32605e3d79104c4a57f55af5c165d207d32ee52f0e2138183
font_01_sfnt_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 10336 bytes
SHA-256: 9cc929d0d9a957ff7ff5df36bd1f52cfd0482188c4379ae12a797e904410c61b

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