Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea38e83cf40e9d3e…

MALICIOUS

PDF

74.7 KB Created: 2021-05-31 02:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 47ea8c4ad6a3ce218ce724d9da234b38 SHA-1: 27339872175cc1ea493734aca1cec71efc3bd83b SHA-256: ea38e83cf40e9d3efa36a4fc15bce2b0a793da0eab81ea7d68ad75b244bccca4
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL suggesting a lure related to employment surveys. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/123?utm_term=employment+engagement+survey+template PDF link annotation
    • https://jipunone.weebly.com/uploads/1/3/5/3/135349916/482a1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393220/normal_5feb8ced56424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499651/normal_600a66f7a996c.pdfIn PDF document text
    • https://jesemokomu.weebly.com/uploads/1/3/4/6/134687046/1971256.pdfIn PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/lolozeruwepew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_606e591223067.pdfIn PDF document text
    • https://rodazikajoreme.weebly.com/uploads/1/3/0/8/130874285/lugegefoxirap_tuwepekobaxupu.pdfIn PDF document text
    • https://gotedajasokidu.weebly.com/uploads/1/3/1/4/131407980/papudopuvebeba_saxejojeb.pdfIn PDF document text
    • https://donadoleli.weebly.com/uploads/1/3/4/5/134519335/1414145.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/1bf139200.pdfIn PDF document text
    • https://mawakizuk.weebly.com/uploads/1/3/0/7/130775730/9278021.pdfIn PDF document text
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/3ddb8dc113ae9a.pdfIn PDF document text
    • https://nuvarimo.weebly.com/uploads/1/3/1/3/131378817/kogazitofarodotisi.pdfIn PDF document text
    • https://pelefazefipaguj.weebly.com/uploads/1/3/4/8/134892892/jikujaw_lugasizamu_riranebikuwed_wigoxuvaxisofa.pdfIn PDF document text
    • https://nifisutabunus.weebly.com/uploads/1/3/4/6/134634245/xodige_zuxenolobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471488/normal_602b8ecf35787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_60494b48c77af.pdfIn PDF document text
    • https://badazunezibak.weebly.com/uploads/1/3/5/3/135338398/ruvifiximede.pdfIn PDF document text
    • https://geselumagema.weebly.com/uploads/1/3/4/6/134695037/fumipipubew-fejigipuz-xurezeme-dusasaseje.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/nupuvep_ketafe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b594dc90-d60b-4b41-9773-e46541fc3dca/jovifudapewufuxekenig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d6c31d-477e-4da7-97eb-1bd64db4270c/90439486556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c65282-7e78-497f-822d-f2e0c9922529/logitech_-_harmony_ultimate_one_15-device_universal_remote_-_black.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_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 5256 bytes
SHA-256: a2a48e61a4542523016be5f2c9adbd3086a9a141a4d3ff23751fc337d7994e0d
font_01_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10608 bytes
SHA-256: 3da9649fa2f41affc114d374ea6a5cfe64f82e1cde687e08191be9e353a7f0e4