Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ba9dddbdb4fb58…

MALICIOUS

PDF

70.3 KB Created: 2021-02-21 20:49:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 03a6ff91fca590adb81081f84a704b3c SHA-1: b338bfc829e4bd888e7d8599e6797639fc2672b0 SHA-256: 55ba9dddbdb4fb58f19daafc0097de5e62e6f37fd436607c8e84f8a7805bc5f5
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 one specifically mentioning 'free esv bible app for iphone', indicating a phishing or scam lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of multiple external links and the ML classification point towards a malicious document designed to redirect users to potentially harmful websites.

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://crophysi.ru/123?utm_term=free+esv+bible+app+for+iphone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423700/normal_60278b337abef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_602e6e7420d4b.pdfIn PDF document text
    • https://cdn.sqhk.co/zibepidok/hi3hjjA/poached_eggs_vinegar_taste.pdfIn PDF document text
    • http://twoup-viktoria.online/dinamicas_presentacion_para_adolescenteswmxmn.pdfIn PDF document text
    • http://henrysavbr.site/possessivpronomen_bungen_b2j8wzy.pdfIn PDF document text
    • http://rankingcoach-apps.com/batting_cages_almeda_mallopofu.pdfIn PDF document text
    • https://cdn.sqhk.co/jabakujivim/qxiegd2/33997103051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374686/normal_60126115cb65f.pdfIn PDF document text
    • https://zejizatuziw.weebly.com/uploads/1/3/0/7/130739720/gijikuxo.pdfIn PDF document text
    • http://prod-fruit.space/tatutijusujekau5zly.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/dzibRjj/zong_free_internet_2020_today.pdfIn PDF document text
    • https://cdn.sqhk.co/zijopenuxafi/gh2fj6G/muvelej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415068/normal_6006bce816b18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463300/normal_60050e612b6db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fccd337b572b.pdfIn PDF document text
    • https://tibaxefuxi.weebly.com/uploads/1/3/4/0/134017075/tesinudalebu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 5144 bytes
SHA-256: 4170e55316877c5c20cbd5ef16bdf5ebd2ebfb4c90e51b5d4b6d26a52d8e3cb7
font_01_sfnt_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 10772 bytes
SHA-256: 2dd541f97b67bdd8e35cc54eacd5983effcff07921766910b94d8dbb4b962109

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