Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd15a30b96f0d001…

MALICIOUS

PDF

77.8 KB Created: 2021-03-06 14:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5338a12870d5162961cc88ad51607333 SHA-1: 148d35b9bc662e48c8459c2104d88bc2771a3269 SHA-256: cd15a30b96f0d001c496fa663557e542e5896df5a29fa0ac546f7323ea28c940
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://gimoguvi.ru/award?keyword=casio+pathfinder+3246+manual+espa%25C3%25B1ol PDF link annotation
    • https://gerudupox.weebly.com/uploads/1/3/2/7/132712596/ruguf.pdfIn PDF document text
    • http://tatuxuvoziparu.mywebcommunity.org/refolesuwi.pdfIn PDF document text
    • https://zupelewelasilag.weebly.com/uploads/1/3/4/5/134594614/5039ae06.pdfIn PDF document text
    • https://xisasuwida.weebly.com/uploads/1/3/4/4/134472621/naduxepivuwew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488558/normal_60046d51cc5cc.pdfIn PDF document text
    • https://japarikadag.weebly.com/uploads/1/3/4/1/134108792/menulekezise_sapazabim_xaxebegizejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485718/normal_5fe6fae66473c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493917/normal_5ff383051a8f8.pdfIn PDF document text
    • https://nigusejokolutat.weebly.com/uploads/1/3/4/6/134688827/zoviwi-bubotikaxusupu.pdfIn PDF document text
    • https://rogasiwenebagan.weebly.com/uploads/1/3/1/3/131380029/lisarajijazopap.pdfIn PDF document text
    • http://goldotzyv.ru/nibavonoveguvanivuwaki99s4n.pdfIn PDF document text
    • http://latuha.com/psychological_disorders_list8e3m4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_6011ef569d15e.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/john_deere_38_snow_thrower_parts.pdfIn PDF document text
    • https://regogugone.weebly.com/uploads/1/3/4/8/134891767/topud-jabasutabubo.pdfIn PDF document text
    • https://gakosokilexavum.weebly.com/uploads/1/3/2/6/132695298/e96e12122d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rewuwuja.onlinewebshop.net/how_many_years_to_study_electrical_engineering_in_south_africa.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/jikafopejedilig.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_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 5936 bytes
SHA-256: ab68efc2c0f90f55150bdd24aa2ea1a9b3a3fb2e62982409817496ca503a86f7
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 10548 bytes
SHA-256: 21e9fceec3c58a8db203aebb241e1948c63ea3d99b9071623909e2f5f02fb5de

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