Malicious PDF — malware analysis report

Static analysis result for SHA-256 4daba2c70efd54f5…

MALICIOUS

PDF

74.3 KB Created: 2021-03-02 11:11:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 037a86311dca9615aa207e6cbf82dfd2 SHA-1: 971928ef34479df8296e25d9ea61a666a267b66b SHA-256: 4daba2c70efd54f56aee2b0da2d0c25b8894461e9c443354d64fcb681a58ed6f
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://seumenha.ru/wix?keyword=student+success+skills+2.0 PDF link annotation
    • http://fagumawegoleleb.mypressonline.com/student_exploration_distance_time_and_velocity-time_graphs_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/jonimaze/3ia8Kjd/magaralulovisav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473052/normal_601fa9420719c.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/torezuxebimija.pdfIn PDF document text
    • https://kofoxutekibefa.weebly.com/uploads/1/3/1/4/131454286/9539886f8028.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445544/normal_5ff2e608af2ef.pdfIn PDF document text
    • https://piwebodowumogoj.weebly.com/uploads/1/3/4/8/134857209/bakawixovega.pdfIn PDF document text
    • https://xekitagib.weebly.com/uploads/1/3/4/6/134668592/daxatiligatuvubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498330/normal_601d267aa567b.pdfIn PDF document text
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/remeremapanosej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450630/normal_5ff4cfa4e4953.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420028/normal_60049aea4ec15.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/tanirapik.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
    • https://s3.amazonaws.com/mavixu/vukozilifajobe.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/semesipavisix.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/51010084471.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_off0000db99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 4872 bytes
SHA-256: 2653b015031ce11f25e62c6f523c016fa34d9b60444f5bcf74640f5a64f3d636
font_01_sfnt_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 9976 bytes
SHA-256: 9084c1f3093e83ae4c37584cb82548eb04724afa5cd6c524cbfa5cbf0dd544b3
font_02_sfnt_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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