Malicious PDF — malware analysis report

Static analysis result for SHA-256 d440af241ebf2d09…

MALICIOUS

PDF

78.1 KB Created: 2021-02-04 14:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 46ca2685c9e499807e027d56de37a755 SHA-1: 1bf0c52aedcc97735e545a4b11dff5bff24bb689 SHA-256: d440af241ebf2d099f5343d544e8e9ef76aeb8767f6cb707163e22e24a50e0b1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on link farm services. The document body, though heavily obfuscated, suggests a lure related to 'Ielts gt formal letter samples'. The presence of numerous external links and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to redirect users to potentially harmful content or generate ad revenue. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jottigo.ru/aws?utm_term=ielts+gt+formal+letter+samples PDF link annotation
    • https://widonudafedezu.weebly.com/uploads/1/3/0/7/130776490/mofejorufoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_5fe9816e57c9b.pdfIn PDF document text
    • http://vududodudo.22web.org/treatment_of_psychiatric_disorders.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/1c5797c95d.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/cqy5heJ/cach_cai_mod_ben_10_trong_minecraft_pc.pdfIn PDF document text
    • https://sufixekanol.weebly.com/uploads/1/3/4/7/134712322/sewin.pdfIn PDF document text
    • https://cdn.sqhk.co/kesufetumo/bmibjJz/waves_tune_live_tutorial.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/38d4c2a7c6.pdfIn PDF document text
    • https://zojopufowe.weebly.com/uploads/1/3/4/5/134523349/rafagom.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/lonozote/57697118106.pdfIn PDF document text
    • http://figejadinopi.rf.gd/appendix_1_form_rex.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/tadekijomotijoziwajoxot.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/windows_10_upgrade_assistant_microsoft.pdfIn PDF document text
    • http://nufewaruxemo.epizy.com/belahan_jiwa_kahitna.pdfIn PDF document text
    • http://kogogugo.rf.gd/sbi_exam_syllabus_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/puvorobewedidataba.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_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 4792 bytes
SHA-256: d25a7a8b40b9e5e1134b5b900f617f22094db75ffa44146d6925f2256a577655
font_01_sfnt_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 10388 bytes
SHA-256: 6271c2c47293655a24a59d01c74fae1493ddd7460dbc4c56893a4338ff425552
font_02_sfnt_off00011cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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