Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec8a7260e372c89…

MALICIOUS

PDF

74.2 KB Created: 2020-11-10 11:57:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6f81ea3e1c528562b97383e6a3412880 SHA-1: bd3f7b001139924acdb4e32801ca4a7073f008d9 SHA-256: 3ec8a7260e372c89f2e8e62b747f02a5b3841027267955c07eb4ee4380a4afba
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, https://traffine.ru/strik?keyword=algebra+2+glencoe+workbook+answers, which is likely intended to lead the user to a phishing or malware download site. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffine.ru/strik?keyword=algebra+2+glencoe+workbook+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_5f9154c19bfb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5faa1729a90c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449602/normal_5fa9e2977c1f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382192/normal_5f9d4f21575a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef87363-5b5d-478a-a757-7f44c291952e/killer_bean_full_movie_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f8149c7-ed3c-432a-8b05-9414fcc892e5/dusapupik.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/24522378987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f031b0a-15b7-4a2b-923c-c60b674652ec/sojejiped.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/dajasuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c95cb9f-1ea1-42c9-a7fe-bd28e50b890b/49497336385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d804de06-c4d5-4060-9a2d-b93a38466fb5/zatobedavegipedotejak.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/4945437193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ea1aba-e5d0-411f-b99d-5db83b7561b0/rekupojugabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f01fe19-0a02-4f76-aa4a-baef0c8769aa/lenaw.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE82 5384 bytes
SHA-256: 8e6aeadf6cb5a2c928039250a4746bbab6b3d7ca369e7502d337627186c5cbb0
font_01_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 8260 bytes
SHA-256: 61bcf55a1f2f59bd38a2cfd6bfc051f5ccfa124d0ffa4248a4cf6490adefcc8e
font_02_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 10372 bytes
SHA-256: a68d17e946e85ae29d7b8ac475f206117ab776bee315abb20898b27f340051de

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