Malicious PDF — malware analysis report

Static analysis result for SHA-256 dede61177f8f92d2…

MALICIOUS

PDF

74.7 KB Created: 2021-02-26 22:02:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: aea95bf7f0eefd7054e4d36261f99e5d SHA-1: 1de9e33984d983f5555240725bf75828e3fc0ca2 SHA-256: dede61177f8f92d276dc48da863fc73f47acf62fb3f30a52b1310c0825872c73
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to direct users to a network of websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external URIs points towards an attack pattern involving redirection.

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://gimoguvi.ru/123?utm_term=can+a+person+see+if+you+share+their+tweet PDF link annotation
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/budokaxejuzodojato.pdfIn PDF document text
    • http://jajifejeda.22web.org/33739850614.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/the_parker_inheritance_book_review71q46.pdfIn PDF document text
    • https://kagukemo.weebly.com/uploads/1/3/4/8/134884413/9846a0aa2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413122/normal_5fd5f48e82db9.pdfIn PDF document text
    • http://stassikorskyi.com/3480256475gf8ux.pdfIn PDF document text
    • https://sudomudes.weebly.com/uploads/1/3/0/8/130874284/9436658.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/sajatofubote/bhojpuri_devi_geet_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/clasificacion_de_anomalias_dentarias.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/payroll_accounting_entries.pdfIn PDF document text
    • http://fopagozijudiri.epizy.com/ccdc_5a_template.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/reporteros_de_la_historia_grecia_completo.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/gudega.pdfIn PDF document text
    • http://nowesiredud.epizy.com/asymptote_equation.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_off0000e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 5056 bytes
SHA-256: f8ed7935b76248acda04f012fe16504bb856416e999e20e25c74df58d355e134
font_01_sfnt_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 10992 bytes
SHA-256: 8f8e1d9a10191ab937c439686dd6e2b9370a816800d06e63f31448a01f296beb

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