Malicious PDF — malware analysis report

Static analysis result for SHA-256 229e8b8144d4b7bc…

MALICIOUS

PDF

73.2 KB Created: 2021-03-02 19:02:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b6c9335dafb9e616d0240b1b1979ad30 SHA-1: 3e2b12c81f17b7ee90ce6b79f6cbd05efecddfe8 SHA-256: 229e8b8144d4b7bc0d8f2f240148e71338481f18e828a6de8b22544d1c708245
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, suggesting it's designed to host numerous external links. One prominent URL, https://jumiwimov.ru/strik?utm_term=what+is+the+simplified+form+of+44%252F50, is embedded and likely leads to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://jumiwimov.ru/strik?utm_term=what+is+the+simplified+form+of+44%252F50 PDF link annotation
    • https://cdn.sqhk.co/soziwariru/icQhjfn/talking_tom_cat_2_download_apkpure.pdfIn PDF document text
    • https://duparumiwope.weebly.com/uploads/1/3/4/7/134707207/xolipupofeperen.pdfIn PDF document text
    • https://cdn.sqhk.co/fazejitev/cghgi0d/girilarivoxaxup.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/7600240.pdfIn PDF document text
    • https://jerewetazawupej.weebly.com/uploads/1/3/4/3/134384555/9138743.pdfIn PDF document text
    • https://cdn.sqhk.co/kapideto/jfYVBhe/64084595397.pdfIn PDF document text
    • http://rating-bookmaker.ru/how_to_clean_the_keurig_2.0_needlenpp74.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/kefefetafij/44688555784.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/31745837228.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/antares_autotune_logic_pro_x_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/29396382441.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/candidiasis_oral_nios_tratamiento.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/expanding_and_simplifying_algebraic_expressions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/34324184610.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/25747934256.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_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 5684 bytes
SHA-256: fec532e845021bf9d18650bc52db49818216844de27a7cbbe8cbfb74e1014da8
font_01_sfnt_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 10716 bytes
SHA-256: 63b661e894864fdc8de1cb952c756180e8792e2e5ab1f36626f346b952055c1a

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