Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8fbed15d1f4eff…

MALICIOUS

PDF

80.4 KB Created: 2021-05-15 04:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 81ba38f86277145e82b819fd5432eacf SHA-1: 901e95ff7e8e57d914568370bc634aee8ee2530e SHA-256: 8b8fbed15d1f4eff4a8d7115a1c8d6fbc58e31cb275e2b6861bbbdfd974e371f
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The document body, though heavily obfuscated, contains text related to a product review, likely serving as a lure. An external URI pointing to 'jumiwimov.ru' was extracted, suggesting a phishing or malware distribution attempt.

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://jumiwimov.ru/strik?utm_term=is+amazon+fire+7+worth+it PDF link annotation
    • http://apeech.ru/how_to_charge_ravpower_pd_pioneer3pw4r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_606ea6b22dbf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_604fc37f7dba4.pdfIn PDF document text
    • http://creditreportfast.info/47261543435ndwfp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456705/normal_606dd6629b269.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368225/normal_5fc68fbd794e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472188/normal_6008eae84e118.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390097/normal_6005b6ff5a712.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/cb91473b-d076-4616-8ec8-d61d143e00a6/veguxutejofugegupiditopiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4dd388-5286-4c28-809e-264fc6d36592/bijinedorolewajoxogiseg.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/ethical_issues_in_international_business_practices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17a01c91-a877-4952-ad82-0605817ff5f7/tajifabulaxeruji.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/ponizejoxaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c7a3da-4999-474e-bc2a-7d41fef04b35/korunosolumepufibaval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b23c8915-64d5-4361-9226-14593420249e/como_hacer_una_corona_de_adviento_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990c9d82-7b15-4655-97af-4d0b024c3807/the_secret_book_amazon_prime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f4a10e5-6827-4e0c-8d2a-7c47913f8103/how_much_do_you_make_a_month_in_the_navy_reserves.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/pudaxunozipuxufopetalubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7e7b7a-834f-432f-935c-fe29f0d6ca89/14461055019.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_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 5132 bytes
SHA-256: c27b981b1fcdd74edf63e9d1bd20ff3b3931e54d98e9bf1a019223b5a0be937e
font_01_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 11388 bytes
SHA-256: 3ce504856d1b36838392466ea85e0758487ff56355307ecf5b8ddca52b898589

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