Malicious PDF — malware analysis report

Static analysis result for SHA-256 857683a3225dd280…

MALICIOUS

PDF

58.5 KB Created: 2020-12-11 09:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 04c38bd456490a6140def87acfd167d7 SHA-1: 7668b2c88936f13cac6a93e5e564c85b63a23f8b SHA-256: 857683a3225dd280c51efea288ef1ef05ba9a1399e05f7b4f985a08a39fbd4ce
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain, likely used for phishing or to serve a second-stage payload. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/123?utm_term=watch+donnie+darko+director%2527s+cut+online+free PDF link annotation
    • https://nofizosol.weebly.com/uploads/1/3/4/5/134500220/ripaguvuvadodaf-mogekepibo.pdfIn PDF document text
    • https://vugesajovor.weebly.com/uploads/1/3/4/2/134265649/f79d1ff5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc1c5d3a3bf4b14abaf5581/t/5fc6e63f56cd4459b3a925cd/1606870592017/define_invaluable_webster.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/51154408036.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3a28aaffbf90a66fb884b/t/5fc5f327f8cdb769c6b0cf43/1606808359735/chief_seattle_letter_to_president_pierce_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/tcc_southeast_campus_gym_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/71149712116.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1571bc30a162e0c558f21/t/5fc42cec173fb5383b2751e0/1606692077051/rock_band_3_achievement_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c48c104edf1d778017d3/t/5fc35ca1e18c5c478e666409/1606638755042/vijub.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc72365a4d75e5252f326fb/t/5fceb3955664f342cf1e36d3/1607381910657/tonowutemafebiwogip.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/wojurawamedosuvuzupibed.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_off0000a9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9BD 5220 bytes
SHA-256: e81653d7136240420c7da57e65515a16e5b4a6be9b965a3e60985e558c2894e2
font_01_sfnt_off0000bb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8B 9872 bytes
SHA-256: 7ca4dcb0890b790f60b674a6bbee394976c0630b91ac9cbc951eec8f789fecb7

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