Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec6536279c5e380…

MALICIOUS

PDF

73.7 KB Created: 2021-02-16 00:26:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5daf9f2984bbde7dc47c6ed92cf1f234 SHA-1: b0ce648dc0fc60ce4b4d9659909b8814b85ebf35 SHA-256: 6ec6536279c5e380a071ec79d8b6e21f4ca364dedf0e26b1dd5c405875b1faa9
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 machine learning model and ClamAV, as malicious. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to harmful sites.

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://druttle.ru/123?utm_term=what+country+is+me+before+you+on+netflix PDF link annotation
    • http://winfreeiphone.xyz/196124299019tu1r.pdfIn PDF document text
    • https://wufaderafezika.weebly.com/uploads/1/3/0/7/130776219/garuvazulitoxi_terob_pisave_guvatujawi.pdfIn PDF document text
    • http://maroron.22web.org/24216120933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444864/normal_600d8f758891b.pdfIn PDF document text
    • http://gradstroy.su/jim_wendler_531_excelnk4dx.pdfIn PDF document text
    • http://groby-ritual.online/family_tree_worksheet_for_adultskowej.pdfIn PDF document text
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/a39927.pdfIn PDF document text
    • https://rezusoroporinon.weebly.com/uploads/1/3/2/6/132695427/dojirijulozigug.pdfIn PDF document text
    • http://thestablestl.com/wivuwijujujizizuzei8kpb.pdfIn PDF document text
    • http://kamaz-ftc.com/kumitetoxetojoragef8hpj.pdfIn PDF document text
    • http://boguvijuximu.22web.org/96254681827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469104/normal_5fdbcf04e8825.pdfIn PDF document text
    • http://pop-marketplace.ru/zesenedie2nf4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nenenadixipuso.rf.gd/zudex.pdfIn PDF document text
    • http://refubexat.epizy.com/bootstrap_4_form_center_button.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/blender_cheat_sheet_blender_guru.pdfIn PDF document text
    • http://lisunamubeso.epizy.com/informal_letter_writing_examples_for_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/sizebovabozuxelutojud.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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 5444 bytes
SHA-256: d368571887033a37f87c0feaffce714b4daeae0c9ad0bd509c424b4916eb64b7
font_01_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 10456 bytes
SHA-256: ad8dcd4a50586392bc7a9802fd57bd9799a67144a167daa9562509c80c91c030

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