Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91289210c26a548…

MALICIOUS

PDF

74.3 KB Created: 2021-05-30 04:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3b4073bd052890917d8e6c51ed3aaa42 SHA-1: 52849cf14974ee13acc7c25a5ccaa0f722b57c16 SHA-256: f91289210c26a5485ec6633e1e5cc2e58bf3830d059b1c86e37c8cdffbb35da7
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 pointing to Weebly and other free hosting services, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or to host further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or content-serving lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fipijoxat.weebly.com/uploads/1/3/4/8/134888739/vadufinew.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4494874/normal_60558e3a0a2dd.pdfIn PDF document text
    • https://mibiduzomezo.weebly.com/uploads/1/3/5/3/135327428/4538896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_6056f92c7a512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446770/normal_6038ee4aab2b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_603a5e990772a.pdfIn PDF document text
    • https://pusemekit.weebly.com/uploads/1/3/4/6/134680760/lixukosibap_zemolifutibo_tajiwikuketizap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393209/normal_60017695527ec.pdfIn PDF document text
    • https://mabuvolud.weebly.com/uploads/1/3/1/4/131453706/bedafemupupo_xiwofolawipab_magem_dosobawera.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392462/normal_5fc90be2ee6c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495975/normal_5fd0dee578ca7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477615/normal_5ffdf09e652e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471092/normal_5fdfc27e77076.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369664/normal_5fe29689a4abc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403262/normal_6027d9043d47c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427274/normal_600455c612bbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Ecv9gJ3Ok6E/wb?keyword=what%20month%20to%20plant%20tomato%20seeds%20indoorsPDF link annotation
    • https://uploads.strikinglycdn.com/files/afce522f-9c52-4127-9e58-ae4dda0f47d3/kayla_itsines_bbg_workout_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0f8a51-a90f-4354-97ea-f3f1eda487a2/python_write_dictionary_to_text_file_line_by_line.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22af69f1-d34d-4478-9976-f2c31d280b8a/diablo_2_drop_calculator_1.14_d.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_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 5212 bytes
SHA-256: aefac2e80132a1d48ab9fb1314f42ca8ff38ea94a77b0664a112b10c2b2f5fca
font_01_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 10320 bytes
SHA-256: 9b5048967b33d25b2def9e2c0d1e5d3615328cd8497d114c060c1be09eec8a72

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