Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8c2e1cf2789a4b…

MALICIOUS

PDF

72.1 KB Created: 2021-02-27 07:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a763ad3bc690220235b840db745f899b SHA-1: 2a2c1b5cd99b14f5be5e2e54242a9f7eb8c0bc62 SHA-256: 4e8c2e1cf2789a4b39ca6d65f488eb7d0755f7adecb8b77101f759c154a63a87
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The document body, though heavily obfuscated, contains references to external URLs, and the PDF structure itself exhibits characteristics of a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the link farm heuristic strongly suggest an intent to direct users to phishing or malware download sites.

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://golowaki.ru/aws?utm_term=malibu+low+voltage+lights+timer PDF link annotation
    • https://cdn.sqhk.co/vujagefamig/Mijgedo/39570924017.pdfIn PDF document text
    • https://newafiramolik.weebly.com/uploads/1/3/1/0/131070062/xerutijodanaluru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454289/normal_5fe2bbf317792.pdfIn PDF document text
    • https://gunujudota.weebly.com/uploads/1/3/2/3/132303168/likivowazopepejop.pdfIn PDF document text
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/9c2c1e7a5018f.pdfIn PDF document text
    • https://jikovezogid.weebly.com/uploads/1/3/1/4/131407088/b7087a14b2ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485172/normal_60092be039b6c.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/what_elements_are_in_palm_oil.pdfIn PDF document text
    • https://cdn.sqhk.co/mofekuma/gRjijhi/2328690472.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/fimigivefafugenamusa.pdfIn PDF document text
    • http://faxizila.iblogger.org/lugia_s_song_sheet_music_ocarina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xekifoxudiduvaf.rf.gd/pafiliguduki.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/xotovanavata.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/broadsheet_sydney_cbd_food.pdfIn PDF document text
    • http://gelapuduwo.epizy.com/invitation_birthday_party_free_template.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/guided_analytics_definition.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_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 5396 bytes
SHA-256: ee4afc82fa19db16ea7ac98a31014a0a259130376c8330ed3293ee3ff220dfa7
font_01_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 10308 bytes
SHA-256: 89ce55fe4e6cb9249820ffaac21ae4c61501e9356385bfd37055db9096eb38dd

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