Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a4cce80c1a169c…

MALICIOUS

PDF

81.4 KB Created: 2021-01-25 19:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 78c00fcd46fdff4dd77bb3981902ba9a SHA-1: ee032f0918a5cd99a624e8d46fb470bc186d23e9 SHA-256: 62a4cce80c1a169c352be39a9cbc26f33bffe980e7475f0e2fb0f7353e6b3594
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, and one specifically targets 'trafftec.ru' with a query related to chemical reactions, suggesting a lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the interpretation that this document is designed to redirect users to potentially harmful sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafftec.ru/aws?utm_term=chemical+reactions+and+equations+ppt PDF link annotation
    • http://interplast.ru/4581906036u0loh.pdfIn PDF document text
    • http://naziniza.22web.org/29845778129.pdfIn PDF document text
    • http://migajipanijezep.22web.org/metabolismo_de_proteinas_y_aminoacidos.pdfIn PDF document text
    • http://fesupopimos.66ghz.com/nupevevuse.pdfIn PDF document text
    • https://jalesebexiw.weebly.com/uploads/1/3/0/7/130739560/gifokumoba_kefokaj_bisizip.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lapamapifutul.epizy.com/autodwg_to_dwg_converter_serial_key.pdfIn PDF document text
    • http://zusewijoje.epizy.com/oscilloscope_lab_experiment.pdfIn PDF document text
    • http://suzawelo.epizy.com/uniformes_significado_en_espaol.pdfIn PDF document text
    • http://tizepadeda.rf.gd/baotian_scooter_manual.pdfIn PDF document text
    • http://deketinak.rf.gd/computer_hd_screensaver_free.pdfIn PDF document text
    • http://nokarox.rf.gd/22075781850.pdfIn PDF document text
    • http://zebigibozudival.epizy.com/56736807604.pdfIn PDF document text
    • http://wotixoweg.rf.gd/78272872994.pdfIn PDF document text
    • http://diveruwafulebes.epizy.com/eosinophilic_esophagitis_guidelines_aga.pdfIn PDF document text
    • http://gobipubefosoja.epizy.com/sheetrock_basement_ceiling_code.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 1684 bytes
SHA-256: 50d94ef29ac85f6c4a083071b0dc69e6c423c073c0f9f258f9592e50426ffba0
font_01_sfnt_off0000ffef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEF 5344 bytes
SHA-256: 7ce2fcd8f7f54849d67d8ecc1cc02171be1f29cd311ac19d53e3669d36fb3de3
font_02_sfnt_off000111de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 11120 bytes
SHA-256: 711a7eeaca007cfe047bb0a3e29823e6d504c74abce7e99431bc110253660155