Malicious PDF — malware analysis report

Static analysis result for SHA-256 15343e1a19e904e8…

MALICIOUS

PDF

74.4 KB Created: 2021-03-29 10:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3593d7d5bbd1b341ea5daf173edb7069 SHA-1: 59e7f31719565e0c4c50d1c2d5bea507a4b3cbf7 SHA-256: 15343e1a19e904e8b67c1709a1e130056d2f50ae64c47ff58e6b99f94678c81d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://bologen.ru/123?utm_term=ieee+citation+format+word PDF link annotation
    • http://xufededubumavif.scienceontheweb.net/kowazuk.pdfIn PDF document text
    • https://rupevegix.weebly.com/uploads/1/3/4/8/134887155/01dee5b15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365547/normal_5ff62e243e7ee.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/ford_3000_hydraulic_pump_gasket.pdfIn PDF document text
    • https://xakebugus.weebly.com/uploads/1/3/4/0/134018628/8309951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403422/normal_6003610f33dcd.pdfIn PDF document text
    • https://balexasureg.weebly.com/uploads/1/3/0/8/130874281/f544a42a1b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492246/normal_601bb673ccaad.pdfIn PDF document text
    • http://sekelenogake.getenjoyment.net/90965218756.pdfIn PDF document text
    • https://roginolesalit.weebly.com/uploads/1/3/1/6/131636974/mopunes-felonuligesa-luredopi-fonapamaduzu.pdfIn PDF document text
    • https://sakirirolero.weebly.com/uploads/1/3/1/3/131383462/2712160.pdfIn PDF document text
    • https://nokaxogu.weebly.com/uploads/1/3/4/5/134520383/7780579.pdfIn PDF document text
    • https://nalimaxepizof.weebly.com/uploads/1/3/4/6/134662907/5728526.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://misukejijixuke.epizy.com/76700882556.pdfIn PDF document text
    • http://vilipenizubawub.rf.gd/puvuxoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e75aee-4851-40d9-b3dd-22d640b2cbf9/gods_plan_for_marriage_catholic.pdfIn PDF document text
    • http://nabulegewuwal.myartsonline.com/jelinilufu.pdfIn PDF document text
    • http://xiwaresijo.epizy.com/disbursement_voucher_template_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09b9d95-8c0d-4266-84c8-fdae689574fe/bluest_eye_chapter_2_summary.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_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 4984 bytes
SHA-256: a9daa3fcd69331a3a4fbaba0bf6a478a8b614e1ece4014250c357955eff7e308
font_01_sfnt_off0000f6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 11148 bytes
SHA-256: 4ae06d93bc594ed817b35df9a4df2f1ba9090f8ff753481a2f39ed365509f165