Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba4d50c73d7e416…

MALICIOUS

PDF

66.3 KB Created: 2020-12-09 06:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d2090f3a1cdf51f096a1cf29310d27e4 SHA-1: b8cb5d2523423973ee35ac321cb3df5b4b5bb735 SHA-256: 3ba4d50c73d7e416601563c0eda9e1b4c89d37fb487c9e4157e6dfc0f1893970
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 and point to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL `https://trafffi.ru/123?utm_term=dinosaur+bbq+menu+harlem` is a primary indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=dinosaur+bbq+menu+harlem PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457279/normal_5fc495197c61c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388406/normal_5f8fa3796b28f.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/tizedeniluxiz-gefowigujotubu-senunomikale.pdfIn PDF document text
    • https://mumizajasaliso.weebly.com/uploads/1/3/4/5/134598274/medesal.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/jedobufudajewu/mcafee_antivirus_with_product_key.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/pizoribotu.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/label_ear_diagram_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/tekken_3_arcade_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/guidelines_meaning_in_chinese.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/keturelem.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc77bf45c272238a81a68c4/t/5fc8fa3022891c6875ca93d5/1607006768958/pictoword_level_95_answer_key.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0b5bec30a162e0c519083/t/5fccbd08a87f9f1b19d60f4c/1607253257109/master_craft_crafting_and_building.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/rekubow.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/30336482891.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF23 5192 bytes
SHA-256: 4acf52c85e079e70fc6b2d9cebdfef221a6a8d2ed43def11c94f3756edcdf9fd
font_01_sfnt_off0000c0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A7 11772 bytes
SHA-256: d865065b8af2cf279cd454e536a36b39073fc0b1f0eae53837f2222a031dcf30
font_02_sfnt_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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