Malicious PDF — malware analysis report

Static analysis result for SHA-256 203398b3a66de4b5…

MALICIOUS

PDF

75.1 KB Created: 2021-02-15 10:32:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ef6fee8da6791dda3270106f00d8ed4e SHA-1: da345326dde55cea0a4537dc2852ab59ec6548ab SHA-256: 203398b3a66de4b59fe27ccff1586ea47b9f4c93e9e3dc4439adb7f00b4975a3
146 Risk Score

Malware Insights

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

The file is a PDF document that contains multiple embedded URLs, many of which point to disposable hosting and are associated with link farms. The ML classifier and ClamAV detection strongly indicate maliciousness. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context, further supported by the presence of URLs related to payday loans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bologen.ru/strik?utm_term=speedy+cash+online+payday+loan PDF link annotation
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/9833610.pdfIn PDF document text
    • https://dojoxokixen.weebly.com/uploads/1/3/4/8/134878929/lasexibotexup.pdfIn PDF document text
    • http://rawapob.22web.org/23072070331.pdfIn PDF document text
    • http://nojosomefoviw.66ghz.com/gina_asma_pediatria_2017.pdfIn PDF document text
    • https://dozetiwe.weebly.com/uploads/1/3/1/8/131856451/lowixazabuduju_bipokoxes_fovifigominogu.pdfIn PDF document text
    • https://vabadagijuruka.weebly.com/uploads/1/3/1/8/131856539/4210423.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/7jdlBgd/best_turkish_ringtones_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/xqBcije/bakinoxegule.pdfIn PDF document text
    • http://cocobuka3.xyz/brittle_deformation_is_different_than_ductile_deformationo3p94.pdfIn PDF document text
    • http://proflist-briansk.ru/descargar_geometry_dash_world_para_pc_sin_emulador0auvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_5fd3d13c14e6c.pdfIn PDF document text
    • http://acgmgroup.ru/pulalefifonixhn3gk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365540/normal_5fe26c0d64da7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/2224649421.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/28986694462.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/langrisser_mobile_character_guide.pdfIn PDF document text
    • http://pidejekakej.epizy.com/suara_burung_cililin_di_alam_liar.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 5272 bytes
SHA-256: 3cbad66891930e2a2c27c1bc1782a0466fbca9cd1cf94eb65e540e32b435d5e8
font_01_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 11320 bytes
SHA-256: 3a7c5bf9554afa357969ed4f4fbfb751e89164cf235cb2d877d8a2014d52a6cb

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