Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb991fd8928d7906…

MALICIOUS

PDF

65.2 KB Created: 2021-04-04 15:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e2d78a7b1be012a9731058d717e50e84 SHA-1: 8b5af00532eec9736483c4553a2c553e0984d046 SHA-256: cb991fd8928d7906aad9cef213c600f31e60d1a7a7d7b8647f2f12444b14c9e6
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a 'boundary scan handbook'. No scripts were extracted, but the presence of an external URI and the high confidence threat detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/award?keyword=boundary+scan+handbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424011/normal_6019b0d4569f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485299/normal_605af5535f650.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/4101007.pdfIn PDF document text
    • http://tisimewifexumi.iblogger.org/netacad_cisco_chapter_2_answers.pdfIn PDF document text
    • http://futudobofexile.iblogger.org/the_odyssey_book_9_questions_and_answers.pdfIn PDF document text
    • https://vuzufakafedovi.weebly.com/uploads/1/3/5/3/135347170/5755704.pdfIn PDF document text
    • https://gunagejosiva.weebly.com/uploads/1/3/0/7/130738835/1881691.pdfIn PDF document text
    • https://sakojokotinij.weebly.com/uploads/1/3/1/3/131379540/6862163.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakugakukilub.rf.gd/caml_designer_for_sharepoint_2013_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/kosozamaveka.pdfIn PDF document text
    • http://lufixov.epizy.com/rumination_depression.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/70473450596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a4cd82-24c2-44a8-a770-f2847d501a67/lutorer.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/30941949693.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/english_grammar_betty_azar_fifth_edition.pdfIn PDF document text
    • http://pexaniruvuwuwe.rf.gd/java_version_1._8_0_191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e73012e8-eb54-4d05-bce6-4ec04f5e6b7e/29563571716.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_off0000c21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21D 5564 bytes
SHA-256: 6bb656526a1f7c97615cd6e61af7f68ab331a8046be4b15db24f32a64c9d26bf
font_01_sfnt_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 10120 bytes
SHA-256: fe61c5aa6ac67c4ff065db73a0a2798d61ca6d3abc711626c83ba94d176127e9

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