Malicious PDF — malware analysis report

Static analysis result for SHA-256 425e0f8320a61bbd…

MALICIOUS

PDF

80.0 KB Created: 2021-03-29 23:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f42cae0d480fe1b3997a0c59a99241f7 SHA-1: 51ca27434c6340818af15148ec66660fa9c2e466 SHA-256: 425e0f8320a61bbdb357bc7222fdfb820f3f3f3477fe07006294365b9ea249bf
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/award?keyword=cambridge+english+scale+pdf PDF link annotation
    • https://cdn.sqhk.co/segidexu/fPggjgg/real_football_2019_apk_offline.pdfIn PDF document text
    • https://ritukananikunid.weebly.com/uploads/1/3/0/9/130969552/burejipeviz.pdfIn PDF document text
    • https://cdn.sqhk.co/wukiratuxazo/lmZYqje/dumebakirupunidi.pdfIn PDF document text
    • https://cdn.sqhk.co/kapimetavis/hcgfiev/dallas_cowboys_cheerleaders_performance_2017.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/zoxipo.pdfIn PDF document text
    • https://visameme.weebly.com/uploads/1/3/1/6/131636817/pozejubikisuwi.pdfIn PDF document text
    • https://jajufuwupu.weebly.com/uploads/1/3/1/1/131163717/5492486.pdfIn PDF document text
    • https://sokifaxus.weebly.com/uploads/1/3/4/6/134666683/gakatagaker-fipaluwujumu-duvuwojas-babid.pdfIn PDF document text
    • http://dabedera.mygamesonline.org/30726861378.pdfIn PDF document text
    • https://bufasijo.weebly.com/uploads/1/3/2/7/132740378/notivididetefo.pdfIn PDF document text
    • http://rasidafepu.mypressonline.com/ms_excel_macros_tutorial.pdfIn PDF document text
    • https://vovasodakujex.weebly.com/uploads/1/3/0/8/130874601/fobuvarosi_seduza_velob.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/pisik/waremarakujavavekefi.pdfIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_cea9979817c4487bb957863479d350b4.pdf?index=trueIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_f6ec9c84eccb4b48a82d104c37d93f0b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dozuga/pigeximefirevuzokurogej.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/8250933351.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/67435300958.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/crash_course_cold_war_37_answers.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_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 5612 bytes
SHA-256: 644ec55151772d9725d4b1cf51a8cdaa9ccbc981d644a2f4052fa9d2f2736d75
font_01_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 18556 bytes
SHA-256: f6a5fe34e83989892d6815b856de483b9aaf73e53801982db7b8b22601a3bb89

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