Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea729bfe0bc08431…

MALICIOUS

PDF

87.6 KB Created: 2021-03-28 08:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 04eff6a2b95df3b5835c4b437745789d SHA-1: c4a27a521ccea1220c3871b3cd783dbe65e79e36 SHA-256: ea729bfe0bc084310057c2442c9449776cfa4431039f85b0e8bb3a0b5ea90ff8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/wix?keyword=xp32+maximum+skeleton+extended+install+guide PDF link annotation
    • https://banezinalirunod.weebly.com/uploads/1/3/1/4/131437453/renimaxodikuzosad.pdfIn PDF document text
    • https://tugigoboz.weebly.com/uploads/1/3/4/4/134499705/5f441a5c29848.pdfIn PDF document text
    • http://natgood.space/liwavewujiwenagibabopyrsjv.pdfIn PDF document text
    • http://goproonly.com/nokebozuw0jiyz.pdfIn PDF document text
    • https://doxizuzipoleri.weebly.com/uploads/1/3/5/3/135323895/5af083fc14ff8.pdfIn PDF document text
    • https://febefadu.weebly.com/uploads/1/3/1/4/131453100/8187823.pdfIn PDF document text
    • http://copyrights-notices-helps.com/75970131238872c4.pdfIn PDF document text
    • http://topstudy.fun/business_administration_degree_jobs_listv87t2.pdfIn PDF document text
    • https://wasexakenisopi.weebly.com/uploads/1/3/5/9/135982815/3984442.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://tositoda.weebly.com/uploads/1/3/5/3/135312816/2371890.pdfIn PDF document text
    • https://sipadaguw.weebly.com/uploads/1/3/4/3/134322090/7717176.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_54eca91590fb459a8245a19e0714cd79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ac049c-aa25-4030-8e39-28f609d36b37/napapepetajej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff596db-283d-4e26-abe9-5696ee70c6ef/eleanor_and_park_appearance_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e42e7eaf-3ed0-4e8b-a7ff-ae0cbaf3a497/cuanto_es_un_metro_cuadrado_en_milimetros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5779b5ee-6bdb-4b4d-b39c-b1d6b0d37041/wofufetizisepimukisu.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_ed4cca33c5894f29b272f45d2900af41.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bec3183-b8bb-485d-8baa-180d7b58be8d/what_is_rectangular_coordinate_system_in_physics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/385862c7-7a55-4989-9d58-aa946251cb73/92345634818.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_off000117b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B6 5588 bytes
SHA-256: b3a40240f25b9cf4a1db321e29e2c127acf86dd2123ce579d8902ec9c8aaecc0
font_01_sfnt_off00012ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB0 11176 bytes
SHA-256: 8b678f6deeeb416fb55efce5b2a955d7ef8db205e1b54a2de1d90f0505cd4535