Malicious PDF — malware analysis report

Static analysis result for SHA-256 98eee82a36f31fba…

MALICIOUS

PDF

74.4 KB Created: 2021-03-11 17:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 66aeb62da58531de0e4d7dcba89a77b9 SHA-1: 5b4442ed7a3203f9d7365b0d646c01f43f354cf9 SHA-256: 98eee82a36f31fbadde5c5d2dfc7fe6f87d5331b2200f57e77f3d484b28c5756
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://nipisod.ru/strik?utm_term=mercury+15+hp+4+stroke+carburetor+rebuild+kit PDF link annotation
    • https://vidiguwases.weebly.com/uploads/1/3/4/3/134347373/1346990.pdfIn PDF document text
    • https://mozofejetexutik.weebly.com/uploads/1/3/6/0/136051344/207e0.pdfIn PDF document text
    • http://good-production9.site/siweroziraxelomaau9zl.pdfIn PDF document text
    • https://nujalujuxak.weebly.com/uploads/1/3/5/3/135347358/8511271.pdfIn PDF document text
    • http://beststudent.space/gofojifidaec2y5.pdfIn PDF document text
    • https://dejatenuti.weebly.com/uploads/1/3/5/3/135348415/numive-mitutakafideku.pdfIn PDF document text
    • http://iciko.xyz/26946887333iehc7.pdfIn PDF document text
    • http://mattelipsticks.site/juvidumomilobefuh36qj.pdfIn PDF document text
    • http://tells.fun/9811009435mzqrg.pdfIn PDF document text
    • https://femesavez.weebly.com/uploads/1/3/1/3/131383434/zobujopusuxa.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/3240834.pdfIn PDF document text
    • https://lekibuwowobaveg.weebly.com/uploads/1/3/5/2/135295955/gopom.pdfIn PDF document text
    • http://cadenalia.com/142833020012gocg.pdfIn PDF document text
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/samem.pdfIn PDF document text
    • http://leopards.space/814222278794tm68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_adf3ab2e4e6841638795798d739ae125.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_49852d05a88d42979f78c2ddae2574be.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_c99f2ced46494a129192e0c165d451de.pdf?index=trueIn PDF document text
    • https://71bfc0c6-4bef-405a-aee6-9e9dcaab3d12.filesusr.com/ugd/708cfd_913e62642cc94b6e82470a9f4fd974ba.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_off0000e2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 5736 bytes
SHA-256: b5c296ed910d4677b8f52821cecc5ebe156ad3b82065967bf6f846c6355eaf82
font_01_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 11196 bytes
SHA-256: 2a29192f8ed22da643b0117bf2a6509d6a7fa9cf21c506d8dadfb44a14dc54c7

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