Malicious PDF — malware analysis report

Static analysis result for SHA-256 8856a5faaf452615…

MALICIOUS

PDF

84.4 KB Created: 2021-03-04 03:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 785af60b4ed41793aaaead48ca5cce5f SHA-1: f4fcf0b0f0c7e7af281c6bb4db802c601aa91438 SHA-256: 8856a5faaf452615c18cb4d5701aa47b49a9d1ecc8fdb7a271c263e0c72b4cb1
126 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. The document contains numerous external links, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or spamming operation. The embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that the primary purpose is to redirect users to potentially malicious websites.

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 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://seumenha.ru/aws?utm_term=descargar+pelicula+el+lazarillo+de+tormes+2001 PDF link annotation
    • http://sipipewawezizuf.getenjoyment.net/are_all_7_harry_potter_books_illustrated.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485157/normal_5ffc680f573b8.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/ethical_hacking_training_institute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5fe78649436d8.pdfIn PDF document text
    • https://disebaxixifos.weebly.com/uploads/1/3/4/7/134714932/7882d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403404/normal_60109f7f1c988.pdfIn PDF document text
    • https://xuxedujuwa.weebly.com/uploads/1/3/5/3/135345360/zagemafiw.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/the_one_real_thing_espaol.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/26204499615fhzv9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_601e215b8204f.pdfIn PDF document text
    • http://soldatskaya6.ru/tabesuxuzelada9uubz.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/dogberry_much_ado_about_nothing_character_analysis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455179/normal_5fcce5f3e9289.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/summary_of_translating_grandfathers_house.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/how_to_train_your_dragon_2_music_soundtrack.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/71473231858.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://padegijogul.atwebpages.com/how_often_to_clean_jacuzzi_jets.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_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 5544 bytes
SHA-256: a83040996dbb97ac9be0f5d350ebfebec86ee78a11e50ebf989220b1e6355fa9
font_01_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 12720 bytes
SHA-256: 562e1d4188ed0e49808a0c6b3374aa2408b95f662e4f0377676df20797ea4ae2
font_02_sfnt_off00013420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13420 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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