Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19c5fb69e19eb71…

MALICIOUS

PDF

78.5 KB Created: 2021-03-09 19:34:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fea58179cf6415e9bf641a336da66ea2 SHA-1: 98eaa6f92fee2ae46d8bb44a3c9e960af0818983 SHA-256: a19c5fb69e19eb71450f16bb55c8fecde4fdf22c5465e6fb614f280d800615c4
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 a significant portion pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/award?keyword=ultimate+bestiary+revenge+of+the+horde+5e+pdf PDF link annotation
    • http://gosoxegekiri.mywebcommunity.org/what_does_a_car_wash_include.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/81061513514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_60120a4d355cb.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/lexupan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_5fd77ba27c7e9.pdfIn PDF document text
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/6066294.pdfIn PDF document text
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/tijokurolav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491148/normal_5febf4f1cffbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426073/normal_5fcdf26f8b6f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422637/normal_600b07c4a315d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://reniwen.rf.gd/gipamafapimuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a9f4bb6-dede-4ff3-8fef-471fc481efdb/94692589307.pdfIn PDF document text
    • http://telusomabufa.onlinewebshop.net/tasibexavusajonixaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4023f5bd-2c8c-47a8-bf06-b199cb6fae1f/82027155890.pdfIn PDF document text
    • http://sazororazinub.epizy.com/85597487503.pdfIn PDF document text
    • http://nuvebuxuloruvux.epizy.com/minecraft_galacticraft_1._7._10_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519b754b-4e67-4620-84ec-808a2d5fe34c/13186704074.pdfIn PDF document text
    • http://pejatopofir.rf.gd/m._a_admission_form_uos_2019.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/texas_instruments_ti_30xa_scientific_notation.pdfIn PDF document text
    • http://wibekemuxeni.epizy.com/58015755021.pdfIn PDF document text
    • http://kesolimasakifi.myartsonline.com/what_is_the_jesuit_oath.pdfIn PDF document text
    • http://vawerudarasikow.myartsonline.com/what_is_the_starting_salary_for_an_international_business_major.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f931df-bbec-4054-9ab3-389471ab0248/how_to_build_a_home_office_in_the_garden.pdfIn PDF document text
    • http://duvodix.myartsonline.com/niriwojisuzojixepuf.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_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 5872 bytes
SHA-256: ea2ccd63b316bbfdfd45b7514d217260cd1d4e7f4ae40705d7d1dc06afafb982
font_01_sfnt_off0001098e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 10184 bytes
SHA-256: d8251baece0afd3d0058f242ab3e3ccb95c2221fd07471863503ff7749806674

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