Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f02d1d7cdaea38…

MALICIOUS

PDF

77.0 KB Created: 2021-03-26 06:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97d9b885256da0a69c401f67bcd32035 SHA-1: ea0164bd17f77eae26d3e4c813cfa42e05c20bc1 SHA-256: 52f02d1d7cdaea38db990e039d5f6c563833cab96ba67aec919cfd0b9597369b
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://soxebez.ru/award?keyword=ankle+fracture+rehab+exercises+pdf', which is likely a phishing lure disguised as a document about ankle fracture rehabilitation exercises. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the idea that the embedded URL is the primary malicious component.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/award?keyword=ankle+fracture+rehab+exercises+pdf
    • http://jevuzedozuk.iblogger.org/tilusezevofozijeris.pdf
    • https://cdn.sqhk.co/jutalufelex/a9ifAhi/41097665438.pdf
    • https://cdn.sqhk.co/videmixolute/5fjd5Oh/401k_forfeiture_account_balance_sheet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c029edf9-3838-411a-b5aa-8fe717f571c4/64278160202.pdf
    • http://zifojaxi.rf.gd/assassin_s_creed_origins_performance_guide.pdf
    • https://s3.amazonaws.com/baxadelefofibuz/31297159483.pdf
    • http://magelul.epizy.com/83059288475.pdf
    • https://s3.amazonaws.com/fajeloninesitel/vejowopowafirilubutap.pdf
    • https://uploads.strikinglycdn.com/files/139c9812-15a9-4b1b-ad2f-9d2a58ad793a/dungeons_and_dragons_3.5_bard_handbook.pdf
    • https://uploads.strikinglycdn.com/files/1efa0f20-a1d8-442b-919d-5fcde6653c8b/runidubupuziwikoxa.pdf
    • https://s3.amazonaws.com/dutimajizowa/dental_radiation_protection_program_template.pdf
    • https://s3.amazonaws.com/mesixadelomomo/43090525939.pdf
    • http://tobifovibel.rf.gd/english_standard_version_bible_download.pdf
    • http://gigisijopa.epizy.com/cognitive_ability_test_sample.pdf
    • https://s3.amazonaws.com/kulinisokakewi/belajar_photoshop_dasar_untuk_pemula.pdf
    • http://bufixel.rf.gd/jugakupij.pdf
    • https://s3.amazonaws.com/zonebon/ballad_of_gay_tony_100_mission_guide.pdf
    • https://uploads.strikinglycdn.com/files/69b252df-e694-4bfb-bd23-363c09dfbcac/david_attenborough_a_life_on_our_planet_timeline.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee41.bin
c9d06d9a7e455b1029114e134e605fd9e409d23be22d9a9fff7e2751850671bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 5504 bytes
font_01_sfnt_off000100f2.bin
b75b835f9e8fdf4be3c58fb975abb308cd2931e3dbe979a5b8ad2bb3f42be426
pdf-font-stream PDF embedded font (sfnt) at offset 0x100F2 11008 bytes