Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a79adc6339d3e10…

MALICIOUS

PDF

104.3 KB Created: 2020-12-06 09:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 66f1d9fb4f975a09b91b9deba3f0e75b SHA-1: 9d92314213d448aafce3de432c17a93430206d67 SHA-256: 5a79adc6339d3e10d7443703f1321ce0d727e83257a1c540ff371d376bba89f1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized PDF documents, suggesting a link farm or phishing attempt. The primary malicious URL, 'https://trafffe.ru/strik?utm_term=white+oak+elementary+school+north+carolina', is presented as search results to entice clicks. ClamAV and ML heuristics confirm the malicious nature of the document, likely serving as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=white+oak+elementary+school+north+carolina PDF link annotation
    • https://jajivinejide.weebly.com/uploads/1/3/4/3/134354145/vemoxekexi_sukow.pdfIn PDF document text
    • https://nemegadixutore.weebly.com/uploads/1/3/4/6/134689972/1715297.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/nijefakipo_fijesafelajesow_gumujaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/kenmore_washer_owners_manual_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/biblia_romana_ortodoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff8758b1-9ed0-440a-a228-d6d452f09e73/free_pop_slots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6546858f-94e2-4f11-8472-d076c9ac7185/tofutidoxasilomapalufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/180c20a9-7063-427f-a81b-529cf3468ea7/6584820620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57709bf6-8b52-42b6-a0d9-b96615ff199e/xanupegofutasepawiniti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4758359e-6935-4822-b90b-9b3f1ab0e844/75060084102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48897897-6491-4e74-b619-ae1963b97a06/81838428600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e233ab7-659c-4725-afc4-78280c651fb2/resumo_do_livro_preconceito_linguistico.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_off00015d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D22 5216 bytes
SHA-256: db50ca5f074a791206a139c22f76553fa9a22a69992dcef5133a5367bfd3b7bc
font_01_sfnt_off00016ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EC9 10960 bytes
SHA-256: c0f77b3d8ce3f879a67a4e1a712196a2b7476aab7ac1fdd5ff15b6c32adc7047

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