Malicious PDF — malware analysis report

Static analysis result for SHA-256 2053c05b345c4f9a…

MALICIOUS

PDF

73.6 KB Created: 2021-03-01 21:04:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cb352c814bd94e6a64598a79fc963c04 SHA-1: 7bd1f423400b4b92d665b5e074cfd81099f7a177 SHA-256: 2053c05b345c4f9a730cff5b7656f72ae6c31a43f127b2816da36d479cbb75bc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary URL, 'https://zajinet.ru/wix?keyword=thank+you+ma%2527am+long+questions+answers', is likely part of this malicious infrastructure.

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://zajinet.ru/wix?keyword=thank+you+ma%2527am+long+questions+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404103/normal_5fd7f31f73f71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5fc6978d18589.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/nike_resistance_band_training_exercises.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500200/normal_5fc6b890e11bf.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/4b5e3feb48f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_5fc8b19188a7b.pdfIn PDF document text
    • https://naruvemekojesez.weebly.com/uploads/1/3/4/6/134685524/nosaxefitenef-vusilak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458628/normal_5ffb2b008654e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sojidalome.rf.gd/danoxafux.pdfIn PDF document text
    • http://tefadipa.epizy.com/the_copernican_revolution_thomas_kuhn.pdfIn PDF document text
    • http://juxawewoguseku.epizy.com/how_to_make_shear-thickening_fluid_silica.pdfIn PDF document text
    • http://zenudaxefuk.rf.gd/google_sheets_conditional_formatting_rules.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_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 5468 bytes
SHA-256: 93e15a26926f01035099510c6d226d219d4f31a856bf856cbd7f04f7e2cb2149
font_01_sfnt_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 10240 bytes
SHA-256: d9d4df2aca8b74f34466aa85f34b43365a88bcc8de0e6765a466d235c2001c7b

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