Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc33cce82a022c55…

MALICIOUS

PDF

72.3 KB Created: 2021-03-17 21:22:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 389187e719101b02faf4ae4380ca2da2 SHA-1: 96cb2105c20ae21c906a663d55b19c62bd9fa678 SHA-256: cc33cce82a022c55f721db1bcfcce55d75d376477f74d25460b0a430a5f45262
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. One prominent URL, 'https://pelibifir.ru/strik?utm_term=lg+tone+infinim+hbs-900', is directly associated with the malicious verdict and ClamAV detection. The presence of numerous links suggests an attempt to drive traffic to potentially malicious sites, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/strik?utm_term=lg+tone+infinim+hbs-900 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443610/normal_60449235d52c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_60436d8154e1f.pdfIn PDF document text
    • https://solujasamaro.weebly.com/uploads/1/3/4/6/134695729/986d65ccd3.pdfIn PDF document text
    • https://gemajoxow.weebly.com/uploads/1/3/4/7/134721961/52b0c.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/d31b4638-8311-46f2-b685-4a5c42d2daab/69966757650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8edb43-0d7d-464c-b283-08b0774795e2/how_much_george_foreman_worth.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/honing_steel_angle_guide.pdfIn PDF document text
    • http://wumugajus.onlinewebshop.net/harsh_mohan_textbook_of_pathology_8th_edition.pdfIn PDF document text
    • http://bukezodebas.onlinewebshop.net/gaxurulidogute.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/gta_5_assassination_stock_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/zedoxusevexudep.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/new_bengali_movie_free_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/18015355460.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_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 5252 bytes
SHA-256: 576c82c23142d2b662c4d5a71fd3c938afbd515a3120adc7165a1c88965a1342
font_01_sfnt_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 22528 bytes
SHA-256: 282f136dc211f8426db564684a2ec9a08bfd07e1caec0ef61a345dd5f51e1990

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