Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8253b2c4d3901d1…

MALICIOUS

PDF

77.3 KB Created: 2021-06-13 01:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9a2f171ac9979ace47b96343069ded17 SHA-1: caca2773a5f64bf2be6347ba0a07d99441b50b80 SHA-256: b8253b2c4d3901d18625854aa0dda35153ac73e70eae5a1d50a39656c212321a
96 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 external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/pbw?utm_term=report+writing+format+cbse+class+7 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413374/normal_5fe562736fe9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473622/normal_603817a85e3e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450417/normal_5fe3c90a1636e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474722/normal_5ffd645d4a3fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446264/normal_606758c65b316.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4456391/normal_60b6f129acfeb.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4417220/normal_60b647025b40f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413701/normal_601a488005cda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_60c02c3392950.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387243/normal_60b27d4460750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_60530c59cf347.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414335/normal_5fd06fec90ef0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412158/normal_602a0d693baf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530910/normal_5ff41b92e30b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_60491a0d58295.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464083/normal_5febc256e33f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_601dfdd4189fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377391/normal_60035f72b9365.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/0dd440c1-bd35-4d84-b0a0-1677d53d52fc/kindle_instructions_paperwhite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f41672-ade3-428c-8219-d2585f514fec/joxorupewibabibobitaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3409e1b5-b57b-4f7d-8621-50c06efb4218/echo_srm_225_trimmer_head_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46320bce-4073-467c-bcf4-d77670f7978e/pofufabavamemitivuzave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e65fa55-d4e6-4f78-82aa-6a2f785ecf3b/how_to_start_learning_salesforce_lightning.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_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 5656 bytes
SHA-256: 0343ecbfe7c7f48be57d6aff772d5c10f6ca24e9aa210380e22ec7edb47ce0c3
font_01_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 10188 bytes
SHA-256: f80ab6a3b27b153232342d473b13485364509b4d34f86cca7c6f5d812f4c4f2a

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