Malicious PDF — malware analysis report

Static analysis result for SHA-256 820b6df72da8c2a5…

MALICIOUS

PDF

82.3 KB Created: 2021-02-18 11:20:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 341a6b318ca7fd5cd489342aba2f2aed SHA-1: a40a5aa423bb440d99fcbf91c390ed896af27099 SHA-256: 820b6df72da8c2a580e6acd360906d4d5aa27df74a2f5637fa292c0a6ca44cee
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords that suggest a lure related to electronics, potentially aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=nook+hd+plus+battery PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372354/normal_5fc7a181102bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394071/normal_5feeafbdbb1ec.pdfIn PDF document text
    • http://mmeueue.space/14553790161qav3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406455/normal_6028913c2ef73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498404/normal_60214e46e2507.pdfIn PDF document text
    • http://wurulef.22web.org/jenkins_xunit_test_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391013/normal_600405f21f20a.pdfIn PDF document text
    • http://balonedud.iblogger.org/jobs-_to-_be-_done_market_discovery_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_6011fb9106ffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468274/normal_601caab7f0673.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bulalowisu/types_of_biotransformation_reactions.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/tamil_news_paper_telegram.pdfIn PDF document text
    • http://gakenefux.rf.gd/general_knowledge_mcqs_with_answers_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/georgia_mandated_reporter_phone_number.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/45837163649.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 5048 bytes
SHA-256: 59c87cdd7118d563f23bd69e32f4090832c2bb370d72c23512b623a6f42fa082
font_01_sfnt_off00010871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10871 10884 bytes
SHA-256: c6272ab1dd1301b049d43837504a1ff10394b9498f9303483ba07c89d32df994
font_02_sfnt_off00012c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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