Malicious PDF — malware analysis report

Static analysis result for SHA-256 28052d9d932b8220…

MALICIOUS

PDF

71.6 KB Created: 2021-05-12 08:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5cea5abbc364c9ee184bae4723942040 SHA-1: 79c0316f118d20c08a13a75e3c5615aa1839a81f SHA-256: 28052d9d932b82200646f381d82d1be9c184a4bcd43298bc25f1a3eae349c443
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URIs, with a primary suspicious URL pointing to `https://midufefew.ru/strik?utm_term=monster+vape+mod`. The document body, though heavily obfuscated, contains keywords like "Monster vape mod" and metadata suggesting it's a lure. The presence of many links, some on disposable hosting, further supports a phishing or malware distribution scheme.

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://midufefew.ru/strik?utm_term=monster+vape+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404727/normal_6026bf597f623.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500911/normal_60037e4da06eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_605b65dcd4135.pdfIn PDF document text
    • http://maykistore.ru/what_happens_when_you_plead_nolo_contendere735d9.pdfIn PDF document text
    • http://rapegutuxipik.22web.org/31046685758.pdfIn PDF document text
    • http://sale20.site/rodukadanenzige7.pdfIn PDF document text
    • http://cozyplacefor.rest/bibonosibamirabuturugouvnp7.pdfIn PDF document text
    • http://merovew.xyz/47548203094cz7oe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_6031c3a3bee7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sigulovoben.rf.gd/fakejafofeniw.pdfIn PDF document text
    • http://pubemoxux.epizy.com/jewakogeroxisaxutoliru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f4cd22-410e-44b0-9050-ba2d89dca5a8/is_the_movie_21_based_on_a_true_story.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/fasaz.pdfIn PDF document text
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_f363f008bc364943bebf59e56d5ffb37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libeganot/formato_de_inspeccion_vehicular_mantenimiento.pdfIn PDF document text
    • http://veratab.epizy.com/linotesukiliwazi.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/babilemixosapinax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92077f07-c5ad-494f-bb17-8d7617e6df57/dutch_oven_recipes_camping_breakfast.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/a4_sheet_dimensions_in_mm.pdfIn PDF document text
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_92e62014f7784b71856f9a9df9de6936.pdf?index=trueIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_d104eca483b448c987648be50a07c0f4.pdf?index=trueIn 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_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 5136 bytes
SHA-256: 79d76b44f7826ef81a6ea4f059a9b3c3a2a7038e7bcea1525bdd73eb2162e3e5
font_01_sfnt_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 10944 bytes
SHA-256: ec1867e00d812952ce602d6f1b082382f996dd53b89f47319c345fda2115c460

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