Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec3f07e83503e1e…

MALICIOUS

PDF

92.4 KB Created: 2021-03-19 13:40:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e3326a28563ea672f90ac3ee56909d84 SHA-1: 7ef596168298b62a755fddd691904bc7a5e3c3da SHA-256: eec3f07e83503e1eeec159140329c80d57765ae9af4d0a5ccceb2ea65120c5be
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains embedded URLs that point to disposable domains, suggesting a phishing or link-farming scheme. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=maglev+vertical+axis+wind+turbine+pdf In PDF document text
    • http://watomadoxaxa.iblogger.org/ejemplos_de_enlaces_ionicos_resueltos.pdfIn PDF document text
    • https://cdn.sqhk.co/rotefuver/aywf6zT/activity_launcher_android.pdfIn PDF document text
    • http://rakapugijumub.sportsontheweb.net/95800913648.pdfIn PDF document text
    • https://cdn.sqhk.co/rusobotakox/k9zihhf/toca_life_city_apk_data.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/hjao9mU/49192830763.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vejebuta.rf.gd/fibegupelanelizupazufovo.pdfIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_c4d47e3af1ba43b4a40d5c5258e9b1a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/potamotaz/gta_wasted_sound_effect.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/xelotizajutemoxanu.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_44390d9be5214f34a8cd219daa3d1d73.pdf?index=trueIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_8d5a546964c647da92d3233b95bd313d.pdf?index=trueIn PDF document text
    • http://dizekalukojulap.rf.gd/jerezuganenevegil.pdfIn PDF document text
    • http://futakanawus.onlinewebshop.net/91886709504.pdfIn PDF document text
    • http://bewefesa.epizy.com/pisuwekomomulasojevaze.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_d3da62cc97cc4473a970f07b903abfb5.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_57325e344d954bbc9af44197610270c1.pdf?index=trueIn PDF document text
    • http://pimoxonevuwewax.atwebpages.com/61029694447.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_off000129b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B0 5688 bytes
SHA-256: db81a54a5c907df895aca782e7a496e25c810642718b970099f5c940ff49c4c1
font_01_sfnt_off00013d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3A 11360 bytes
SHA-256: e8b830b92aeed4db4c33ae2a10a65a210bd6a961e315e6316597db0d5769ef76

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