Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb79fa9291193db5…

MALICIOUS

PDF

68.1 KB Created: 2020-11-11 03:05:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1bfb56f74448bf346eb424c620490ff5 SHA-1: ec65d59aff7086f56cadb27f878af5d8f15f7ad1 SHA-256: fb79fa9291193db55c231f9f089d021b3c4f3fa2b90363caf69548ce63719f59
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external links, forming a link farm, with one prominent URL pointing to 'traffnew.ru'. The document body, though heavily obfuscated, appears to reference assembly instructions for a gazebo, a common lure for phishing campaigns. No scripts were extracted, but the presence of external links suggests a potential redirection to a malicious site or the download of a second-stage payload.

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://traffnew.ru/aws?keyword=allen+and+roth+gazebo+step+by+step+assembly PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376096/normal_5f8c66a746f3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379969/normal_5fa591e477057.pdfIn PDF document text
    • https://sewiwojura.weebly.com/uploads/1/3/4/3/134371681/gekizulibebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393898/normal_5f980828c32aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389582/normal_5f9a39e8d925a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_5f8f60b6dfcd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_5fa0029f8e25b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_5fa1df5613df1.pdfIn PDF document text
    • https://dokipodaj.weebly.com/uploads/1/3/4/3/134306773/8505331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415929/normal_5fa03f0fcac81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb9536e-57be-4370-8b44-51fe3271b807/college_louis_jouvet_07320.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/nulamololi.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/32367856564.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_off0000ccc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC1 5656 bytes
SHA-256: d4e5f5f2bd36cea0d592bee506a178cd0c7132ca9ae4deb08df017e0dd4d9a3b
font_01_sfnt_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 10284 bytes
SHA-256: c03314d57f5550a642fcf5b58e601cf8f187923842c244f6942282236b234a9f

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