Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd8ffd443599257…

MALICIOUS

PDF

78.2 KB Created: 2021-03-30 22:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 47246810f5b708b3344cc561b183379c SHA-1: bf624576543fa04345f1b26aaa51f461129cf568 SHA-256: 4dd8ffd4435992575cd5cff1f017fb7dec169b9a1db00e69f35a11067955f84a
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting. No scripts were extracted, but the presence of external URIs points to a potential download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=cardiomyopathy+types+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416490/normal_60075608d6a28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445107/normal_60205ad8763b8.pdfIn PDF document text
    • http://goduvide.22web.org/lejopojupiwimesezifesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_5fd7708074b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_603e65445db31.pdfIn PDF document text
    • http://sekujirimabasas.getenjoyment.net/octet_stream_to_converter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446759/normal_600f058a29b6a.pdfIn PDF document text
    • http://rivugijunamusi.mygamesonline.org/lenunazoni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490754/normal_5fc5a8746cfbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380887/normal_600552c9db833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_600bb90fa94b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369158/normal_60609237902f9.pdfIn PDF document text
    • http://vitetoka.scienceontheweb.net/tegokotazuzemoru.pdfIn PDF document text
    • http://gokojun.scienceontheweb.net/63299759181.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fidegaf.atwebpages.com/livre_d_astronomie_debutant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52b73a30-0351-45ac-8a25-864b8cf2c311/is_garmin_usb_cable_different.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64bcf116-5614-48ec-bc58-f8c6b6ab80bd/xifoz.pdfIn PDF document text
    • http://bajekixizosi.myartsonline.com/deep_breathing_for_anxiety.pdfIn PDF document text
    • http://welalakewap.epizy.com/6814302216.pdfIn PDF document text
    • http://fuguzametekobo.myartsonline.com/14012095185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2288a312-d4a3-4460-8423-e7578443c138/57213131588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/669b98e7-112c-427b-9bc6-98d5f144170f/lugares_para_ir_el_14_de_febrero_lima.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_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 5256 bytes
SHA-256: 4e203a9b1d91d68b375c56f824b4c5c68168607d310a7d8046561047aff6ccb2
font_01_sfnt_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 11080 bytes
SHA-256: b51cea25c6531d67522f4d626d537ca303c3d6d81eee6cff56ef9315eb2d2eda

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