Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9c0196860e6e3f…

MALICIOUS

PDF

79.0 KB Created: 2021-03-09 19:06:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2fc01f119ee3276fb724a1a0d8ac1082 SHA-1: 51444a3e220e87eaca738712b84e9abe125fb0c3 SHA-256: bb9c0196860e6e3fd64080804db173689b970d63eb180d2a06d20802382b6309
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-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://kuzutuzo.ru/aws?utm_term=photoshop+cc+tutorial+for+beginners+pdf PDF link annotation
    • http://betixisu.22web.org/rogers_cable_tv_guide_online.pdfIn PDF document text
    • https://bonuwokepav.weebly.com/uploads/1/3/4/5/134592975/4546270.pdfIn PDF document text
    • http://xiwasaruv.66ghz.com/mosuwitozano.pdfIn PDF document text
    • https://podozipejubepa.weebly.com/uploads/1/3/4/8/134893890/8087556.pdfIn PDF document text
    • https://tivifetanesa.weebly.com/uploads/1/3/5/3/135347176/fixitefaper-kebuxunukepemi.pdfIn PDF document text
    • https://vinozesuwoda.weebly.com/uploads/1/3/4/6/134685541/bezevelifepalab.pdfIn PDF document text
    • https://minizejemeroro.weebly.com/uploads/1/3/2/7/132740725/levoxiteg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kirojera.rf.gd/how_to_figure_out_a_3_circle_venn_diagram.pdfIn PDF document text
    • http://gokobuvutojo.epizy.com/10458438168.pdfIn PDF document text
    • http://kodireso.epizy.com/90865922717.pdfIn PDF document text
    • http://fitunugiwa.rf.gd/1929636598.pdfIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_7c2cf649196c4ae2830985238d5f409c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/cisco_webex_add_on_windows_7.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_7d068ce151d14b67b7151674a6169191.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/worksheet_excel_vba_activate.pdfIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_d5d20d432caa4dbbb2cce4205d59f747.pdf?index=trueIn PDF document text
    • https://66e0d7df-d9e6-4599-8f92-a47fa3a4044c.filesusr.com/ugd/8b97dd_00c1066810624ceeae6dd05461ffc4e8.pdf?index=trueIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_a97e6539cccb48198f36e74b9ea5c6af.pdf?index=trueIn 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_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 5556 bytes
SHA-256: cfaa47181e5a9866528272efe7ecbb3f2d35e950aa76fe5d8e27e11af834dae2
font_01_sfnt_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 10664 bytes
SHA-256: c1476719423d1937412e53aee0404a5d5d30e2d7c1f64f89d543bd23ac56da0f

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