Malicious PDF — malware analysis report

Static analysis result for SHA-256 e908c657e3d2a3e2…

MALICIOUS

PDF

80.0 KB Created: 2021-03-25 13:10:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 920fa10d1f01da6894fe3e6cacb58029 SHA-1: 0a44d103e16a7a9230ddacfac16ab434066d6a57 SHA-256: e908c657e3d2a3e2e5dd90c1619fb88e406d7544e47a0e71c6d7d54c63b32c5f
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/123?utm_term=cricket+19+switch++code PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466398/normal_601cb35a47f39.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/esophagitis_diet.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/gWhg5ia/judamikibalumilutanov.pdfIn PDF document text
    • https://cdn.sqhk.co/zodenizekija/o4icfmj/34077389728.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418590/normal_5fefb3c3b111e.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/iczidib/video_editor_with_music_app_android.pdfIn PDF document text
    • https://cdn.sqhk.co/nijalemivowo/hjOjfhe/sabowuguzefebunolokajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501975/normal_6044933007c15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487902/normal_5fd651327486f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_6049174c0fed5.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/sodumakuge.pdfIn PDF document text
    • http://fukazab.mywebcommunity.org/42836610903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464707/normal_604b957f89ada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374211/normal_5fcf134a9fd8e.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/gftifRp/rock_music_2020_clean.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_603e8a8e3d99f.pdfIn PDF document text
    • http://relodifalixogo.scienceontheweb.net/63005597590.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f29de62-cdc3-4c80-91ca-e37aa64b613d/difference_between_cycleops_fluid_and_fluid_2.pdfIn PDF document text
    • https://baad1762-ad72-434c-be9a-9de7d8068d01.filesusr.com/ugd/61395f_78b9688206ae45dd8ab18138d0c81265.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/943d139d-4c77-44b6-8e38-91cee4422285/18367720383.pdfIn PDF document text
    • https://c534e673-b245-4a6d-8787-855fe96db707.filesusr.com/ugd/e19215_51db49c1dd1c4fafb8c5e3df83b6f1c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa0f676-abcc-426f-9291-7b5c07c4b2b4/mtd_riding_lawn_mower_carburetor_cleaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1addcfc-73fa-4f58-b740-44f9229a5324/alabama_high_school_fastpitch_softball_rules.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 5056 bytes
SHA-256: c31599977829113b915d8f5b7eccf9e781f6ee8e9d30100c2e4c6c7dba50aad8
font_01_sfnt_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 10816 bytes
SHA-256: c2561e1e4531a06b1a69bac5477de7de07b99910a6230bad66985b646b27f69c
font_02_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 16776 bytes
SHA-256: c815f2feadecfd2faa087d917034861db2aff1401fc1e8468b01c2892f13533e