Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bde1e883fffc1a8…

MALICIOUS

PDF

72.5 KB Created: 2021-02-07 16:20:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 00abd7770bc33a49c53694f011fbaacd SHA-1: af10fa343e2081feff805b810400b9996bcf87f9 SHA-256: 6bde1e883fffc1a8abb76f50e5c1bab0829706c8468766c533206193af0dcfd8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=divine+intervention+5e+wiki PDF link annotation
    • http://visiblawty.com/affordable_formal_dresses_onlinesii4s.pdfIn PDF document text
    • http://mosaniz.22web.org/picsart_tutorial_app_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_60182f1b196d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383138/normal_5fe22fe812084.pdfIn PDF document text
    • http://creditpm.com/guide_for_free_fire_official_tipscux4w.pdfIn PDF document text
    • http://bnatural.space/90110563655iqj7u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456399/normal_60110fac5756b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403406/normal_5fcd60e485454.pdfIn PDF document text
    • http://llloooodddd.space/las_vegas_casino_chips_guidekm3mj.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/sabegokek/british_bryological_society_field_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/fabomabemebe.pdfIn PDF document text
    • http://maweriza.epizy.com/melbourne_formal_dress_shops.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/igcse_biology_practical_notes.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_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 3376 bytes
SHA-256: 9e849d6bb567758e71ec6494a6df95f100ecd47862e398cac50f312eb52bed19
font_01_sfnt_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 4596 bytes
SHA-256: 694ef7f3dcac91817080c6312c5c2642e60ca9fb15051dab8a310f94d5a2d794
font_02_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 10532 bytes
SHA-256: 3b764daa89c6e4616846b34208fdf28f4bc9bb57000540d6f611f2620524c466

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