Malicious PDF — malware analysis report

Static analysis result for SHA-256 10394bd0a3b0188f…

MALICIOUS

PDF

78.6 KB Created: 2021-05-23 19:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 850e295c31460966e292bd04b42f8937 SHA-1: bca7a1078f6a59bc7cbd2c9b3e79d33e6e040681 SHA-256: 10394bd0a3b0188fce4cc7d163361a281abe611c483bcd88008f09aa2f7baeea
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to 'seumenha.ru', suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are indicative of a link farm or SEO poisoning technique used to drive traffic to malicious sites.

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://seumenha.ru/strik?utm_term=esl+past+simple+vs+past+continuous+exercises PDF link annotation
    • https://tonezukem.weebly.com/uploads/1/3/5/3/135348251/lozodipabuke_nelunijuze.pdfIn PDF document text
    • https://xasigevas.weebly.com/uploads/1/3/4/5/134595911/kemekufoto_kubasi.pdfIn PDF document text
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/7fb42407b.pdfIn PDF document text
    • https://welaxulisura.weebly.com/uploads/1/3/4/0/134042468/zejopogezisalo.pdfIn PDF document text
    • https://lajezufil.weebly.com/uploads/1/3/4/6/134636359/demukovuba.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/jivuxo/53713685734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7dfb06a-5626-4dab-a7f4-c55f68cb8dc4/lakubojivojedarikada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2bb6fb3-42ae-46f3-9133-c37c31b06d5e/subimaneku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/072398f3-6eb7-4898-ae60-568808fca086/tablas_de_derivadas_e_integrales_completas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34739714-98ed-41ea-b0f9-5adb59bb3ae5/21815376423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0cf1bfa-54a1-413b-9885-c30c322b0615/93158931173.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/juripebivugaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e235ca-d3d6-4b1f-803e-6b27f002b44d/harry_potter_and_the_sorcerers_stone_book_isbn.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/transparent_text_png_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4854c9-cb3a-4819-ac99-58546b789f82/do_i_get_a_refund_if_my_package_is_returned_to_sender.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/boss_tu_2_vs_tu_3_buffer.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/taxonekaka.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/tijutumagedosijazovika.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/wheel_of_fortune_ielts_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_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 5164 bytes
SHA-256: 6ce262cb7e8d3df0ba9efc9f78ff5e43ac6fc192e60615e940872434fb57059c
font_01_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 10828 bytes
SHA-256: 44629a6023e5be01c6f2fd9c202468b517e94de14bab3f4a0f17710c8262f0fe

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