Malicious PDF — malware analysis report

Static analysis result for SHA-256 a488df8bff993fb4…

MALICIOUS

PDF

74.5 KB Created: 2021-03-15 07:55:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46b3ce3ac468eacd1336ae94e95be9a5 SHA-1: 5567f10fac525f39ebf93471bce46e95a907970d SHA-256: a488df8bff993fb4d802ca14125cd3808039fa480cdd907ed20050dd78e06b40
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, and ClamAV detection confirms it is a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'medical biophysics pdf'. The presence of embedded URLs and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful content or download further payloads.

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://seumenha.ru/award?keyword=medical+biophysics+pdf
    • https://cdn.sqhk.co/tirewugodus/fUgehjZ/racing_games_free_download_for_windows_7.pdf
    • http://xeporivol.iblogger.org/14296157469.pdf
    • http://100p-f.ru/what_is_the_poem_dream_by_langston_hughes_about8hjwg.pdf
    • https://cdn.sqhk.co/zojoguxuban/x8gcONR/ping_pong_table_for_sale_near_me_used.pdf
    • https://cdn.sqhk.co/lekabadixi/90vSjiM/fejolebowawupa.pdf
    • http://podcard2020.site/pizodanizusosawekaluukhvd.pdf
    • http://laura-egorova.ru/kujalarilokubuq9s2.pdf
    • http://50off.pro/yamaha_ef1000_generator_cost7hy50.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zonurupadul.atwebpages.com/accreditation_and_quality_assurance.pdf
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_321ed4049b3543a683ce75f73ffcc338.pdf?index=true
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_c7fa7288b7774642978cf447c95f4a17.pdf?index=true
    • http://rawigukegopafot.onlinewebshop.net/elite_platinum_pressure_cooker_troubleshooting.pdf
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_63ef219d248541c9b12d1432275737b3.pdf?index=true
    • http://gemunedipu.rf.gd/29293625221.pdf
    • http://monofetifalo.rf.gd/xopaxolidejozigu.pdf
    • https://d7e981a8-8c4a-445e-aef0-60d3d4911bd2.filesusr.com/ugd/65d69c_3539c45dd47d4562be0661e94146b654.pdf?index=true
    • http://lupevara.epizy.com/pubaxabiwijufusoli.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9dc.bin
409af1ef4bde461bbecd5058d85d42c4f8a9005bcc844cd478caeb1eeeb23c63
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 4996 bytes
font_01_sfnt_off0000eadf.bin
9e356de503e1c5964cd885a58f28eeb9836d1b7ccd7108d0cc674e7dbbf422f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 10724 bytes
font_02_sfnt_off00010f52.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F52 4324 bytes