Malicious PDF — malware analysis report

Static analysis result for SHA-256 136bae2f7ea02567…

MALICIOUS

PDF

83.5 KB Created: 2021-03-20 21:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 271463b9b3f69f89cb365ba71735c862 SHA-1: c410cb135598c731f2d83fa0e93a17832e18518e SHA-256: 136bae2f7ea02567f30f0c5faca502f5b97c718e0120160868ce98c97695565d
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains multiple embedded URLs, one of which is `https://vilenefex.ru/wix?keyword=geometry+dictionary+pdf`, suggesting a lure to download further malicious content. The document body, though heavily obfuscated, indicates it is presented as a 'geometry dictionary pdf'. No scripts were extracted, but the presence of external URLs and the malware detection strongly suggest 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://vilenefex.ru/wix?keyword=geometry+dictionary+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421050/normal_5ff7d05978419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_602ec2f21dc63.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/computer_engineering_notes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_6014f897bc3fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392869/normal_6003e9fcc60ed.pdfIn PDF document text
    • http://kevakigev.medianewsonline.com/85247464067.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/single_variable_equations_worksheet.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/26842365915.pdfIn PDF document text
    • https://xekozetona.weebly.com/uploads/1/3/4/5/134508060/pubulumuripumukejar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473031/normal_5fdde7e494959.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/himnario_cantos_de_alabanza_y_adoracion.pdfIn PDF document text
    • https://dugubutufafug.weebly.com/uploads/1/3/0/7/130775350/vufizudagigafulidan.pdfIn PDF document text
    • http://bukapim.mywebcommunity.org/rexebiwifanuvamo.pdfIn PDF document text
    • http://jonipifenukiz.mygamesonline.org/ma_accident_report_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463824/normal_5fefecf4df3a6.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
    • http://fuvarijes.atwebpages.com/radinosux.pdfIn PDF document text
    • http://gubawakelu.onlinewebshop.net/paradox_of_choice_book.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_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 5012 bytes
SHA-256: 7f37835dc9eaca4c94354787b7bb3552b1a5ccab8d034d01be6a5bd843dccc41
font_01_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 10400 bytes
SHA-256: 5ec6b8b6ad685cd6400c3e918f6ddd6c6dbcf257f82046df7a1304e1768c8672
font_02_sfnt_off0001330c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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