Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b277c592d478de…

MALICIOUS

PDF

74.5 KB Created: 2021-06-10 17:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 31e085c0710771bd605581cd0eae4ec3 SHA-1: ad9805765d9721c96012c6c46e20ea188cc3eb4e SHA-256: 36b277c592d478de2b7c389693daf0a2b514897eee6bd98f61942181b42a49d0
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 0.9995

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://oniceh.ru/pbw?utm_term=offline+battle+royale+games+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465390/normal_5fe49a4690424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_600bb1cb7599e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_601a6e5f91a71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497131/normal_604fa2f5dd446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447464/normal_605c69a17105d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493201/normal_5ff165244c451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491965/normal_60257c89c3451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_5fd9fd6c3cf07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404523/normal_602695bc8e427.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/kuxesesobubes-zuzujo-sifatelolone-mavirezuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447096/normal_60ba3bf6b5cef.pdfIn PDF document text
    • https://nunugaborunis.weebly.com/uploads/1/3/1/4/131437119/1851763.pdfIn PDF document text
    • https://jekugisolidib.weebly.com/uploads/1/3/4/0/134097103/33734.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471971/normal_5febe862561ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467576/normal_5fe18079a470c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_6053248eafc65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405467/normal_601bbc1b60886.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/020b5049-1119-4481-a295-acb6fe5f9452/renuplex_medicated_dog_mange_shampoo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5da4fb0-5cb4-442b-9fa8-9516df6ba923/36212944446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f61f52e-b275-4575-8c81-b5efb71fc8f2/segatofojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e9a0cf-31e9-4d14-ba36-ac92663f5c9a/print_foxit_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb04c85-10f2-4fa7-a4c5-f85dc135d86a/acrylic_painting_ideas_for_beginners_step_by_step.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_off0000e688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 5496 bytes
SHA-256: db0d5f05ab2dc6ebb9c0a2bdeab9b127db50355554da3a740b402cd5875454fe
font_01_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 10168 bytes
SHA-256: daad818113a3b23db46311b153b4d04bea325f7736d05849a8a60343ba6ca8b1

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