Malicious PDF — malware analysis report

Static analysis result for SHA-256 c913ed10a52852bd…

MALICIOUS

PDF

75.7 KB Created: 2021-04-25 20:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 13770566420bb7283ee1ce9c7cadbfea SHA-1: 971c7fd2b598b1e5fccb58e977bf31aae3797bf5 SHA-256: c913ed10a52852bd6b3b3d5f311754a36967b42a5e35d0859bbb818bf07aedfd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to a domain associated with phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to pellet stoves, directing users to external sites.

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://seumenha.ru/strik?utm_term=how+to+start+a+pellet+stove+manually PDF link annotation
    • http://setokanekema.mygamesonline.org/apush_themes.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/fjgS7fV/93150790239.pdfIn PDF document text
    • https://cdn.sqhk.co/wavagowew/iThdhf4/84878661816.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/85544674444.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/fimaxukisu.pdfIn PDF document text
    • http://rarubife.mygamesonline.org/bioremediation_journal.pdfIn PDF document text
    • http://forisawidokomor.sportsontheweb.net/population_genetics_ebook.pdfIn PDF document text
    • http://nawitebexu.medianewsonline.com/ximuxor.pdfIn PDF document text
    • http://zukoxofiro.22web.org/48115894356.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/arcmap_data_driven_pages_export_to.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxufazekez.atwebpages.com/carnitina_funciones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a142f9-dd4a-407d-aa57-a6f8ed7cac63/used_ford_3000_tractor_parts_for_sale.pdfIn PDF document text
    • https://78fc25e8-d533-4ec3-a480-3617e8cc0d4b.filesusr.com/ugd/aa5866_6f4de322e4a041a2aae79654c53f562c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b657b1-e043-4970-a71a-de1edfddfb91/nabafixadetowuk.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/ramadan_calendar_2020_peshawar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd4558b4-4bad-464a-8eb8-020e09922a0b/87199123273.pdfIn PDF document text
    • http://povodakav.myartsonline.com/kenukatebu.pdfIn PDF document text
    • https://b0b89e74-75d6-43b0-bb8f-fa2cd9bd5f5b.filesusr.com/ugd/b5ae3e_45ac65bab3d84059b8d48250a5d5df09.pdf?index=trueIn PDF document text
    • http://begafunif.epizy.com/84034888803.pdfIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_bde68a0ddc974f6bbc972a495d6201c9.pdf?index=trueIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_fb619d2c719e407698a56ca86f0ee8b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c9dbda0-fdaf-4188-a65d-322e902786f0/what_are_the_different_textures_of_igneous_rocks.pdfIn PDF document text
    • http://wolawozel.epizy.com/13989114893.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_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 5180 bytes
SHA-256: 114d3a3c9409ff4506a93bd03d39e76a72b34f35390f69a61c73c89743ebbca9
font_01_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 10796 bytes
SHA-256: 526afd091a85151418ec9eff5e8bf5561b76975a0c3e56571aa81a51d111541d

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