Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe72be6f4fa53ed2…

MALICIOUS

PDF

76.3 KB Created: 2020-12-21 02:47:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed14866a43d71cca5e48f22b869f37fb SHA-1: d6c6c57717d0704cbf40126540d9df6f1912f0c7 SHA-256: fe72be6f4fa53ed2ab6553db39695aba3ee707a1c57d34eb248353c3bf9649ec
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on external services. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan threat. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=ark+extraordinary+kibble+food+value
    • https://cdn-cms.f-static.net/uploads/4406501/normal_5fbb353d421c2.pdf
    • https://bikezurikol.weebly.com/uploads/1/3/4/6/134612173/2032245962.pdf
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5f91b9d885153.pdf
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/9554578.pdf
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5fdfd5eea2a6d.pdf
    • https://cdn-cms.f-static.net/uploads/4481285/normal_5fc31909c292c.pdf
    • https://cdn-cms.f-static.net/uploads/4483362/normal_5fbc909807a60.pdf
    • https://cdn-cms.f-static.net/uploads/4530846/normal_5fbf2b67d60be.pdf
    • https://cdn-cms.f-static.net/uploads/4452608/normal_5fb8685173fde.pdf
    • https://cdn-cms.f-static.net/uploads/4413867/normal_5f9902f29baa2.pdf
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5f90bf67ee2ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sosupejuxofedo/ratifying_the_constitution_worksheet_answer_key.pdf
    • https://s3.amazonaws.com/poresi/2004_acura_tsx_manual_transmission_for_sale.pdf
    • https://s3.amazonaws.com/rodigapigeta/95591593497.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7db.bin
8eb86faf3f6e906d6eef2a244f728ee4b7aead4e20e69c62b5b01f3d75754094		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 5148 bytes
font_01_sfnt_off0000e983.bin
1c8ea97a537227eb75dd42aec42ea596d3a9f61b69d8cb5a004a7cb726bafb75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 10896 bytes
font_02_sfnt_off00010eee.bin
77c340ee7fb1d40e09aa0ba1d8dc084c95b2e679ed0699307ccb183b31da846a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 16124 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.