Malicious PDF — malware analysis report

Static analysis result for SHA-256 315c25aab8d13e30…

MALICIOUS

PDF

78.1 KB Created: 2021-05-06 20:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 01d07f5a4996dcff50df5ac2b6bff199 SHA-1: 45c9f0e45425a07f2f65488b88d28cb8985bf651 SHA-256: 315c25aab8d13e309a7ba10bce8d87171e1c137ea8b2a28646be039f0667e09f
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=what+country+does+netflix+have+harry+potter PDF link annotation
    • http://helpcenter.business/vopowibapisuti0kgg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503874/normal_600e442c26d06.pdfIn PDF document text
    • http://wiinorama.space/dedufiwumuvofuvasewfue31.pdfIn PDF document text
    • https://gikovasedubum.weebly.com/uploads/1/3/4/5/134507074/7683416.pdfIn PDF document text
    • http://bioforce-co.site/pojizysj03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_602f437bc54c7.pdfIn PDF document text
    • http://dragonflysagewellness.com/vefobcigke.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://update-win20.online/mepadagexowutorvk2y.pdfIn PDF document text
    • https://rolorizumi.weebly.com/uploads/1/3/4/3/134316308/nibetepizikuj_zuvexotemi_digipeso.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/11945263989.pdfIn PDF document text
    • http://justamorem.com/a_whack_on_the_side_of_the_head_chapter_summaryt0hn6.pdfIn PDF document text
    • http://instapriz24.online/how_to_create_a_budget_for_construction_projectb8unm.pdfIn PDF document text
    • http://lebuvowune.getenjoyment.net/film_shots_and_angles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417543/normal_5fc5f70a74663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_600f0ec80537b.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/armstrong_air_furnace_troubleshooting_guide.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/8615219.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/8d530b53.pdfIn PDF document text
    • http://urott-hu.com/how_to_use_vectors_plot_in_mathematicabic57.pdfIn PDF document text
    • http://dhl-order.info/62719893773fkn8b.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_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 5488 bytes
SHA-256: 3cf3e10b00bd19e78301f66a1b935a4a7d87c084ee15ae671f15c5d08e60da68
font_01_sfnt_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 11704 bytes
SHA-256: 3c6068cafa7b564c44c576a06a8cca3adf85a16aebe98e4eb4c2f6221a89a3e1

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