Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdf4d4b017629c7…

MALICIOUS

PDF

70.5 KB Created: 2021-06-03 07:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0d43bc10513119fb1e9d721449f9b9e9 SHA-1: 702463ac3ee89007b9a4602a4e2cb5a30752a29f SHA-256: bfdf4d4b017629c7eaaa3e2f62f34c2587c712a65b6332a44e1d9da3392048b9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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 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.
  • 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://archism.ru/pbw?utm_term=weight+loss+workout+plan+at+home PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413583/normal_605c971179fe9.pdfIn PDF document text
    • https://wawotuxela.weebly.com/uploads/1/3/4/3/134352856/juxok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387811/normal_6032daf73d7aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464862/normal_60195b213ce13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_60541389bf4f2.pdfIn PDF document text
    • https://zomedavox.weebly.com/uploads/1/3/4/3/134392748/f5d0808aa97c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379473/normal_5fcf582ca723a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480585/normal_604ee8d2a3c37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_60289420a218a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416149/normal_60010bcaa1a5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403946/normal_6062b73883270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_600f628db4cdf.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/56e45090-2b97-42a5-b551-6c52984dc230/39305225918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f95067d6-4f51-4284-bda5-aaa6d3308733/deepak_chopra_21_day_gratitude_meditation_day_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cefb2d8-30ad-4ce7-88bd-9d8d56207f6c/92412126977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb5983e-e62d-4e52-a1b0-546b31119b67/gegewopikaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2c2857-911c-4f42-905a-d7752f37dbd6/79662027101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70491e1b-d626-4620-9841-839844380273/nojasiwewefitumotefamiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9f7e2c-ae1f-4169-8a44-0bea0860e082/58093023814.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_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 5404 bytes
SHA-256: 3110f45de97613c0c0494e7cfb043102c6fd34acf98f1abfcce1c48a33cf9343
font_01_sfnt_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 10060 bytes
SHA-256: 9da358d4daca90f0f7b8a4e71292259dd21f9846c5972a4b240fa4d33a2d972c

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