Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc363a5d3449b6e…

MALICIOUS

PDF

75.7 KB Created: 2021-02-13 00:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 40f5c82f8b57f24f5d7543c37a6fc6b6 SHA-1: ce001bd5426eea40d7603f38656d163aaf58598c SHA-256: 5cc363a5d3449b6e8022e25e4dc624a42deee8b9d288efb2e0a037af633c0638
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://crophysi.ru/wix?keyword=winter+dreams+study+guide PDF link annotation
    • http://lenudes.com/2187906156457rjl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_602167ee18146.pdfIn PDF document text
    • http://topuniversityru.fun/78658901540mfm1p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_600e656cdf4a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369514/normal_60011e054fbb5.pdfIn PDF document text
    • http://eroganoficial.site/muzitawajemr8dqe.pdfIn PDF document text
    • http://samelike.site/17749948352sa76g.pdfIn PDF document text
    • http://maxist.ru/35856463744k9i78.pdfIn PDF document text
    • http://vvinorama.website/wulinivesopusipid7beus.pdfIn PDF document text
    • http://art-practice.org/282774509883ijx7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420468/normal_5ffbc84b3e5e6.pdfIn PDF document text
    • http://verifiedbadges-form.com/botixd851u.pdfIn PDF document text
    • http://mjawebdesign.net/main_battles_of_the_american_civil_war5fyoq.pdfIn PDF document text
    • http://avtoshkola-region26.ru/sirewosonokodumowepixl6tua.pdfIn PDF document text
    • http://ecosbor.net/48925412422nwgut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368504/normal_601cfa5c10854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479214/normal_5fd6d191e40e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://muwuxivikunef.rf.gd/18678506872.pdfIn PDF document text
    • http://gugawojakopa.rf.gd/wilawizagobepu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 5000 bytes
SHA-256: cb88c381d664a5c181b0d0289a47ab4c9329769afc3b7bb5fedd32ce7352c617
font_01_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 10380 bytes
SHA-256: dc899fafdb38f339fbb498f1bfae7a063eb7e2a1aa72102025f74513ca47735e
font_02_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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