Malicious PDF — malware analysis report

Static analysis result for SHA-256 659328b616875bd3…

MALICIOUS

PDF

88.0 KB Created: 2021-02-10 13:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9fe367c52246dd8a39b63c5cf2ea548c SHA-1: 23565de92a8570028d8f35194a11c389cce024df SHA-256: 659328b616875bd3de7ad07ed01e86b29c54269efaa1f1de76125a8f74421f5c
126 Risk Score

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 and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, contains references to 'Neapolitan language lessons' and is associated with external URLs that are likely part of a phishing or malware distribution scheme. The presence of multiple external URIs and link farm characteristics suggests an attempt to redirect users to malicious content.

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://baarspo.ru/123?utm_term=neapolitan+language+lessons PDF link annotation
    • http://nevoxukuri.22web.org/72918185052.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393904/normal_6004775ed1e30.pdfIn PDF document text
    • http://natlab.ru/windows_7_home_premium_oa_download_isow5dl1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471106/normal_6022eb894a384.pdfIn PDF document text
    • http://kengoru.space/24391068822kii4x.pdfIn PDF document text
    • http://bnl-jobs.com/my_talking_tom_2_squeaki91ky.pdfIn PDF document text
    • http://hd-cam-mirror-up1.club/zulabegerazopeverewonoxpoac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484632/normal_5fe95c5fa7468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_6015367c84869.pdfIn PDF document text
    • https://nogulumu.weebly.com/uploads/1/3/4/4/134476008/widaruxizigujakoje.pdfIn PDF document text
    • https://wovugozota.weebly.com/uploads/1/3/2/6/132695813/fujolonez.pdfIn PDF document text
    • https://babixedijifaz.weebly.com/uploads/1/3/5/3/135385025/sabiwusa.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/ifVutCR/horizon_forbidden_west_trailer_youtube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zerujafulo.rf.gd/zefuxutevebunof.pdfIn PDF document text
    • http://faxipobusevive.rf.gd/welizuworasekuzoladevoxot.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_off00011503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11503 4860 bytes
SHA-256: eec18873fd7df141104bc06750fa0b0dfde59804ca352998da27af2804d20720
font_01_sfnt_off000125a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 14584 bytes
SHA-256: 2551cf119b669ee56d6e32da0ad4f5d2a147148732b3a2e7bc2594287c8cd34c

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