Malicious PDF — malware analysis report

Static analysis result for SHA-256 91984627da5d927e…

MALICIOUS

PDF

83.6 KB Created: 2021-05-22 04:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 28ba4f60c79c5c85fd4f9f7d711bcc73 SHA-1: 77e7b8bc91aaf33eebbd22411e36b884e7b617a6 SHA-256: 91984627da5d927ed8131a063a2ff57fb8da3dd9652c0466c89b5957b7d95436
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many of which are dynamically generated, suggesting a link farm designed to obscure the true malicious destination. The primary malicious URL identified is 'https://gimoguvi.ru/strik?utm_term=wordly+wise+3000+book+6+pdf+download', which is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/strik?utm_term=wordly+wise+3000+book+6+pdf+download PDF link annotation
    • https://foxewazijibaj.weebly.com/uploads/1/3/1/3/131379544/5564645.pdfIn PDF document text
    • https://vamemaxodoj.weebly.com/uploads/1/3/1/4/131437173/4438023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454286/normal_602254ed753db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393220/normal_602fea20580b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506170/normal_6007c730e65d2.pdfIn PDF document text
    • https://wesofozuxo.weebly.com/uploads/1/3/4/2/134266961/rosonofamuxigilawotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387224/normal_6052e1998ac43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368466/normal_5fec8e125bd97.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/e067b3c7-e793-4489-b6d1-57ad89e8795a/radical_acceptance_tara_brach_amazon_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05698f11-96aa-42f1-a1d8-50b72d02087a/52449276816.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/kisinoxomebigorelosuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/firefox_49_portable.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/formula_para_volumen_de_prisma_cuadrangular.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/hss_first_terminal_examination_2019_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/constant_contact_template_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb9d1980-fe16-4908-b8b7-d9f027d21a66/43251053403.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/24828347639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36bdcf65-1342-4078-9751-0a194156542d/94669778899.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/admission_form_for_class_11_in_delhi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae82ec1f-ec06-473f-8eba-70e72ad153f6/john_rawls_theory_of_justice_difference_principle.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/21731624760.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/livros_sobre_o_candombl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bdc9734-4592-431e-b01c-1092b4a82ff0/xagojoxigigode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75906fc1-f0a2-41ae-ab5d-96f7ae1d689c/97454705213.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_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 5908 bytes
SHA-256: 8c3246707dc8b75be91527ef970ea9b9b40beead453a8813a2ace088ba5f80f0
font_01_sfnt_off00011603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 12924 bytes
SHA-256: 74365d769e8d9316f069a920c27aea40140eaf6f3a9f71b7eacd3c65b4488ee6

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