Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e122d034c3fa72…

MALICIOUS

PDF

71.8 KB Created: 2020-11-14 10:50:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 253457c41c4d0cc1d0150cec1740c2d6 SHA-1: c8211c6b9e18130187313fb7ee9762bbbe090cee SHA-256: f8e122d034c3fa728e53cb99f3cbc4872270d7695fd5ea41cbf3fea49091b055
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9994

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 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.
  • 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://traffine.ru/123?utm_term=board+kings+hack+ios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422622/normal_5fa99252e3ffe.pdfIn PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/324447b189434b.pdfIn PDF document text
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/vadamev.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/3343619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/remeranexe/jobedikuzixilori.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/english_vocabulary_with_bangla_meaning_for_ielts.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/majepagamujej.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/feasibility_study_example_tagalog.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/976322676.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/25594524533.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC586 5284 bytes
SHA-256: 7db68c6f2cfa5bba6d9e9089fffdad6a482cd45abaf247e5dec978afbb490f54
font_01_sfnt_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 11380 bytes
SHA-256: a9737445033b0164e6f19fcb1bcbdf155357f58caf593fcbd6583d0febb9934c
font_02_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 16160 bytes
SHA-256: ab862ddcc36e5f8abbcc0ec12f45ee2a0a0017beba85073a80867d3ee452b16b

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