Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f63e2f1097246e…

MALICIOUS

PDF

68.9 KB Created: 2020-12-05 07:03:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4dc87d732a91ad00811caf376772f8b1 SHA-1: 18d76dca2e242fdb3ba8d746e78caf44b5fe80ae SHA-256: 83f63e2f1097246e114cebf282a891829eeb97912547294c21a7b0375d5b0050
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or phishing campaign. The ML classifier and ClamAV also strongly indicated maliciousness.

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
  • 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.
  • 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.
  • 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://traffmen.ru/123?utm_term=bee+well+honey+natural+market In PDF document text
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/dipaj_tejobepe_nugaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420939/normal_5f96b633ae04b.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/9011164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483083/normal_5fbc3eb30b8a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f9914af4683b.pdfIn PDF document text
    • https://mufebukevep.weebly.com/uploads/1/3/4/0/134096334/eb068815d37.pdfIn PDF document text
    • https://jusujonolixutuw.weebly.com/uploads/1/3/1/3/131379247/4848509.pdfIn PDF document text
    • https://vuxojamobepu.weebly.com/uploads/1/3/4/3/134333522/kokebupomubuxuzeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_5fc1f34ad0616.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc36b9bcd1e280355e43c7b/t/5fc54d944f983757208dd944/1606765979350/3_point_hitch_carry_all_designs.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/mapleroyals_corsair_training_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/international_business_journal_articles.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4dd3ec89e1c4b8fd7ff57/t/5fc556872dd96f59189f23b8/1606768264425/pentagrama_para_imprimir_clave_de_sol.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3b443e5c7695ca9ad1d73/t/5fcad9ec9d29b56e4df5a89f/1607129580713/22599412164.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58d7ddf132613bbdd2249/t/5fc791e60791337046e92900/1606914540802/mutef.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/soxixevatipapadalakorisad.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/fundamentals_of_business_process_management_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/quiz_on_indian_geography_with_answers.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_off0000d32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32C 5056 bytes
SHA-256: 3d8fc9e268589d25e378311e691d5ea47aa7270c54bf7e024a7d91ad0d18dff2
font_01_sfnt_off0000e442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 10012 bytes
SHA-256: 89b2580929b94f65854731333812f00545aa10790453916cb1e4c624aea56067

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