Malicious PDF — malware analysis report

Static analysis result for SHA-256 a374be2391507971…

MALICIOUS

PDF

70.8 KB Created: 2021-02-20 08:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7df10225646686748e57bdd7bd3fc0ba SHA-1: 248812456c52783b22a82dbdb52014e76412ef76 SHA-256: a374be2391507971f7c8f9b28d3f491c08689c39cd85b5995630a763be5523c2
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 content. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=can+you+keep+a+secret+movie+rating PDF link annotation
    • http://complect-tech.ru/44870752488xqvez.pdfIn PDF document text
    • http://detonic-ufficiale.website/35725617200716nd.pdfIn PDF document text
    • http://leree6.club/zkteco_5._0_attendance_management_software_freejgy9u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_6026d16008587.pdfIn PDF document text
    • http://show-visitor.xyz/pixaneguveguxepekif1tcx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5fd9390ce0fe8.pdfIn PDF document text
    • http://reduslim-officialsite.site/samsung_tv_says_audio_out_optical61m5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuxodenajakifut.epizy.com/razujinofirixe.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/free_html5_grid_templates.pdfIn PDF document text
    • http://foweroboxufafuv.epizy.com/31142384202.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/79007383368.pdfIn PDF document text
    • http://talakukatutevib.epizy.com/75559216366.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_off0000d6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F3 5352 bytes
SHA-256: 4a216e3c21d1aa2b71b16376c6fdf1d3b024782f1580c7274123bec3dce56c28
font_01_sfnt_off0000e92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 11076 bytes
SHA-256: 76da9c0ce05c2dca0261c8e436cb16c90adc41192ef9b8d264107488c9e3c618

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