Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18830599b9204bb…

MALICIOUS

PDF

82.3 KB Created: 2021-03-16 07:16:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 95aea77734436005ebb03d43a3ef98f1 SHA-1: 301d0578ddcbd123627e9fd45cdfd64ac431c72a SHA-256: f18830599b9204bbf68a4acfed327d25c27b636239de2ac0dc5518ea1be18f0c
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://xajibur.ru/aws?utm_term=how+to+master+forex+trading PDF link annotation
    • https://kuximakid.weebly.com/uploads/1/3/0/7/130739256/narexazofe-kopojagu-vomixegi-fapetukijaf.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/11733861486.pdfIn PDF document text
    • https://kodalogodo.weebly.com/uploads/1/3/4/7/134753778/5fa37d8e.pdfIn PDF document text
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/bawunaba-bijopavulexod.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/29975514417.pdfIn PDF document text
    • https://lijimoxa.weebly.com/uploads/1/3/0/9/130969704/7904016.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/rizawa.pdfIn PDF document text
    • https://pizizidoto.weebly.com/uploads/1/3/0/8/130873839/1da280beba1.pdfIn PDF document text
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/be94866cbbb418.pdfIn PDF document text
    • http://womotov.22web.org/tikobagoburafuvub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_6371b3e18f564871b72e29e87a4dfb30.pdf?index=trueIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_fd6862fa6b0a43ee85ff3d8e3d95369d.pdf?index=trueIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/temesubelofojobikex.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_65d655f196364e2a9ce7b6587c60fafd.pdf?index=trueIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_fc01d724921340cdafa99cf242cf7534.pdf?index=trueIn PDF document text
    • http://pupuwifemo.rf.gd/24644816476.pdfIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_afd9e1cb886441918278dfdd2af3accd.pdf?index=trueIn PDF document text
    • http://todidetiped.onlinewebshop.net/estimating_square_and_cube_roots_worksheet.pdfIn PDF document text
    • http://zakefozufasedi.epizy.com/format_code_atom_shortcut.pdfIn PDF document text
    • http://lulojoduvos.epizy.com/bonniers_trafikskola_2010.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_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 5316 bytes
SHA-256: a1fa256730be030e4b0fc36b981fd96bfca52da19a31b8ba7110018370c4d285
font_01_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 11208 bytes
SHA-256: de3d03a568a1e873674b0a681fe5e924a1bd2d92a9da53e0622aa52e10404827

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