Malicious PDF — malware analysis report

Static analysis result for SHA-256 278ba7b2d700d57a…

MALICIOUS

PDF

81.8 KB Created: 2021-04-05 06:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dafbd7ae3e46ce4d66fda08f06618af5 SHA-1: 73a50b91940ee1b7cc1974616fa254dec0d97250 SHA-256: 278ba7b2d700d57a393f088ef2c44bb83a51ca53b9da62de77b34f0dcb536f47
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 pointing to Weebly-hosted PDFs, which is indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous external URLs and the PDF_SEO_LINK_FARM heuristic indicate the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/strik?utm_term=clasificaci%25C3%25B3n+de+funciones+y+ejemplos PDF link annotation
    • https://zukolipiniroti.weebly.com/uploads/1/3/4/4/134494738/5423021.pdfIn PDF document text
    • https://tuvepovuno.weebly.com/uploads/1/3/3/9/133997374/bexipabubo_xarowosirifiza.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/9946454.pdfIn PDF document text
    • https://fadunununi.weebly.com/uploads/1/3/4/7/134747036/rolezikitame-sojazirevij-dixawabexur-zajut.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/fssai_assistant_exam_answer_key5gdki.pdfIn PDF document text
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/vaxipatorizaf.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/telecharger_play_store_android_4.4.2ymj56.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/cb34df.pdfIn PDF document text
    • https://gosizunasinati.weebly.com/uploads/1/3/0/7/130739879/fonokizizewap.pdfIn PDF document text
    • http://znasila.ru/filusugugufatopakosexepitxvkj.pdfIn PDF document text
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/9262915.pdfIn PDF document text
    • https://relulime.weebly.com/uploads/1/3/4/3/134384492/02ed43c8eb35.pdfIn PDF document text
    • http://conicppjry.bid/muchas_vidas_muchos_maestros_peliculsyfi6.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
    • https://s3.amazonaws.com/pewebopufupe/aayirathil_oruvan_full_movie_tamilplay.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_2a78649702304622ac59a7aaa07be475.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tazopaju/exercicios_botanica.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/44562920234.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/southern_district_court_reporters.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_9888333f23734a91b29974c3d81590a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/ill_at_ease_crossword_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/logo_design_contest_india_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/fomubamuleginigedoxovisa.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_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 5344 bytes
SHA-256: fae48440904a0da7b9735123ee701d176b0b02ad25a02a2d5e354e29cd1a7799
font_01_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 11324 bytes
SHA-256: 7df9acc401a2d866912cbc7209429ed8b6c7308cbd87dc8a323e299411543013
font_02_sfnt_off0001298e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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