Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b13b79377fbfd8c…

MALICIOUS

PDF

149.4 KB Created: 2021-05-24 23:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 48b539cdac6a900543779f2ffd473112 SHA-1: 25aaf683928460d6db498ab88ba605e55c725529 SHA-256: 4b13b79377fbfd8c696e28ef0d825047e6a9eeeea3ed05912b1202c6db9eba83
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain, likely serving as a lure for a malicious download. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to trick users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/strik?utm_term=sonic+episode+2+apk PDF link annotation
    • https://visobugogo.weebly.com/uploads/1/3/4/5/134582963/5330544.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366984/normal_5fefc16de4559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_6034d5d663f5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375885/normal_60067138f0c99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_606500c23a30a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413122/normal_5fe36611e27e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378410/normal_605044e89dbb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393359/normal_5fdc5e01c7d17.pdfIn PDF document text
    • https://sunitago.weebly.com/uploads/1/3/1/8/131856801/2d3f7c.pdfIn PDF document text
    • https://xevumijujivo.weebly.com/uploads/1/3/1/3/131383583/powojerodediwe_lefezivelajaba.pdfIn PDF document text
    • https://jirogadipew.weebly.com/uploads/1/3/1/6/131606393/gajojigos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454052/normal_5fc7cd5948c4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zijivevip/excel_vba_find_duplicate_rows_and_delete.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/the_house_of_spirits_chapter_3_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/nationalism_in_india_notes_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0cb12ac-768b-4eeb-a62a-163aa5c6fbb7/tivurifazezoduge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7eaf8ae-282b-4086-9775-808fe032c397/parrot_ck3100_software_update_download.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/vatini.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 85012 bytes
SHA-256: e5ac9b426ebd8881ce0d9522cfc9898513b356579e39fe258b5809a24328e604
font_01_sfnt_off0001f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F844 5236 bytes
SHA-256: f429286e2e6a7485773207929fd6e3270a072d780ab88260b981735db05f5175
font_02_sfnt_off00020a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A30 11764 bytes
SHA-256: d2656b938ed4f75ed71aa029b2ed91ad26101e5c4b89266789da9b236787d200
font_03_sfnt_off000232ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x232AB 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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