Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7b5adc4446deef…

MALICIOUS

PDF

78.0 KB Created: 2021-01-28 06:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f2ae978f04b00861ee16d99376d182f8 SHA-1: 71cb019a7735e38ce2efdcce17fab46e0656c102 SHA-256: fb7b5adc4446deef054baf11a3a5c7c31f001c16e3d0d509fd4f4be017caa28e
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 PDF files, indicative of a link farm or SEO spam. One of the primary URLs, 'https://seumenha.ru/123?utm_term=unity+custom+inspector+for+class', suggests a lure related to software development. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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://seumenha.ru/123?utm_term=unity+custom+inspector+for+class PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495040/normal_5ff0025376534.pdfIn PDF document text
    • https://vamemaxodoj.weebly.com/uploads/1/3/1/4/131437173/vobitulalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463803/normal_5fda5932ab00f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416513/normal_5ff55f1bb707d.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/jdhbjij/how_to_draw_lines_in_ms_word_2010.pdfIn PDF document text
    • https://xixozikitep.weebly.com/uploads/1/3/4/0/134097223/xubop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_5fe62494402a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384048/normal_6003d2c4c336f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385202/normal_5fced92c64f76.pdfIn PDF document text
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/1f2479380ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373778/normal_5fdd1e051d06d.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/kidihem/vimelagejasav.pdfIn PDF document text
    • https://munopufunorari.weebly.com/uploads/1/3/4/8/134881547/josuxusara-pikaxasi-rusututu-fuxuwib.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/4000838.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/tigewibejageju/63461582515.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/6922148140.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/chori_chori_sapno_mein_full_song.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/school_leaving_certificate_application_template.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_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 5252 bytes
SHA-256: ea0636de1e8e4f793f130d6548e5893911b726e373a4cb9ef0fc02ac2f20fdd4
font_01_sfnt_off000103cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CD 11660 bytes
SHA-256: 75f88dff43bcc35b03a302e37c17b7387887fc3bfea162b5a93d97e33b298419

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