Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25906bb6ca3f28d…

MALICIOUS

PDF

100.7 KB Created: 2021-02-05 02:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b7cb0b59fe0cccb45696ae782486cf2a SHA-1: 7066c2fce5b730e8c600ba7887f1247629ce3dd3 SHA-256: e25906bb6ca3f28db7ebb8ac26e9a649d5538fa148f0301d3cae4b46ef63e692
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 of which are to benign-looking but potentially malicious PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=national+electrical+safety+code+2012+pdf+free+download PDF link annotation
    • http://jekigun.22web.org/mathematician_names_and_information.pdfIn PDF document text
    • https://lomimasexoguxi.weebly.com/uploads/1/3/4/7/134736135/monopepadimipenewovi.pdfIn PDF document text
    • http://negurosivaz.iblogger.org/delaware_llc_agreement_template.pdfIn PDF document text
    • http://lujalopenaso.iblogger.org/3d_map_generator_terrain_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kagalitisup/wreqjh7/52089543830.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/fodose/deductive_approach_definition.pdfIn PDF document text
    • http://sefeluxezilire.epizy.com/tiwipefax.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/72537480731.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/parquet_vs_avro_format.pdfIn PDF document text
    • http://katanitape.rf.gd/angola_business_visa_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/waser.pdfIn PDF document text
    • http://zuxebalu.rf.gd/oxidative_phosphorylation_ap_bio_pogil_answers.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_off00014ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF9 5636 bytes
SHA-256: d2e0ac53a7ee72cc58331130b7bc0705e1d95efa956833bab10fdcfa4a8ef1e2
font_01_sfnt_off00016260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16260 10304 bytes
SHA-256: e949b2266a28451304e75ae4cb161bdc7831cd1967958c80ba5f6aaa88382442

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