Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d40510b0a5e28ae…

MALICIOUS

PDF

78.9 KB Created: 2021-02-27 08:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ed05d99f83d9cd1b05787fb7f778f1f3 SHA-1: f258ce35a7dbdf05710b720df02737f243350a2e SHA-256: 2d40510b0a5e28ae5bda675b7220e1748670cbf9bd586ddc2c2712ef656f647d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to redirect users to potentially malicious websites. The ML classifier also strongly indicated maliciousness.

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
  • 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://gimoguvi.ru/wb?keyword=are%20saltless%20water%20softeners%20good PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407781/normal_60192bfa06698.pdfIn PDF document text
    • http://mixevome.22web.org/edu_science_reflector_telescope_525_power_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5ffe20e5ed948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446924/normal_60306501a5678.pdfIn PDF document text
    • https://cdn.sqhk.co/rozamulev/hfjeIgd/nukiwatifisusakamanozob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_601365c1280f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470703/normal_600f77682b072.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454681/normal_5fdf9cc5bd7aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456393/normal_5ffd59fddc4d5.pdfIn PDF document text
    • http://sekizabugurewud.iblogger.org/best_baby_heartbeat_app_android.pdfIn PDF document text
    • https://cdn.sqhk.co/wobimore/bzDu1ie/pet_eye_doctor_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/dEKaLjj/resident_evil_2_remake_leon_walkthrough_part_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://safefimij.epizy.com/vs_code_not_formatting_vue.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/minecraft_1._14_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/circuit_maker_student_version_free.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/kunomodizadizapamoxijumu.pdfIn PDF document text
    • http://buvetixebofexe.epizy.com/3203723868.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 4896 bytes
SHA-256: 341c2c87b9f088dde222e925c9286bdcb8fbe3e6be86301aaebdd00d0d17d387
font_01_sfnt_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 10140 bytes
SHA-256: 7202397e9c25b556195f14b95362d475d5c54c7ec8c0dd693d92f6829c8a033e
font_02_sfnt_off0001202d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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