Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d91d388fb3523a3…

MALICIOUS

PDF

67.4 KB Created: 2021-01-26 10:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2334226402d2fa66599e297f98f2f61e SHA-1: 0bc9395538372d6b2cbb5518bd7a1dd6d98d7914 SHA-256: 7d91d388fb3523a386e4343e07e1bdaf2643147d903de605e5a16f8d3b6a5332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. This suggests the document's primary purpose is to redirect users to a network of websites, likely for malicious purposes such as phishing or distributing further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wb?keyword=horse%20kick%20pro%20review PDF link annotation
    • https://cdn.sqhk.co/kixagixupo/5ggjd5O/butenadepizona.pdfIn PDF document text
    • http://wokokijup.iblogger.org/ayia_napa_travel_guide.pdfIn PDF document text
    • https://kobejepofefes.weebly.com/uploads/1/3/5/3/135317692/wibulavobux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nogojituwizax.epizy.com/aditya_birla_insurance_brokers_limited_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/68531532605.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/full_information_about_computer_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/correlating_rock_layers_using_index_fossils_answers.pdfIn PDF document text
    • http://sivakekixil.epizy.com/57547827667.pdfIn PDF document text
    • http://kowotasube.epizy.com/apt_decoder_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/chilcot_report_executive_summary.pdfIn PDF document text
    • http://norisufa.epizy.com/73066330962.pdfIn PDF document text
    • http://pixutixiziv.epizy.com/bush_s_white_chicken_chili_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/vatebatirasi.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/pevudonojubavatirajanome.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/pifarijerusazomesosujo.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/93896556249.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_off0000cb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB79 4860 bytes
SHA-256: ac44b7703a8478eabbb4268d133ebd156b5181ba77f187be514753cf4f7475b1
font_01_sfnt_off0000dc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 10676 bytes
SHA-256: ee71a0a7cc1ee999eea0acfd6c92be3c70821d816273caaea1c7d46ad7b45acb

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