Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2c759a52fe2c28…

MALICIOUS

PDF

80.0 KB Created: 2021-05-20 23:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9d964e1efe17e724f544ed13b22d2f09 SHA-1: b2da87298cca5ddca2c8a5e97a3833c140ae2578 SHA-256: 1c2c759a52fe2c2889ec8e48efd79e7650f5a522b2309cef62fbe36f3e39160a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, with one pointing to 'ponafet.ru', suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to host these links.

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://ponafet.ru/strik?utm_term=calibri+light+bold+font+free+download PDF link annotation
    • https://pemogadisazur.weebly.com/uploads/1/3/4/5/134583379/muxuwaxopimetoru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448549/normal_5fc93b5ee786e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462732/normal_6066697cee522.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387242/normal_5fe42e348b02d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471723/normal_5fc83e09c2203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5fd2dfce1fcd3.pdfIn PDF document text
    • https://gozikiri.weebly.com/uploads/1/3/4/4/134493270/9a689ac34cda358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498678/normal_603371b0d72d0.pdfIn PDF document text
    • https://pojikajuruwasi.weebly.com/uploads/1/3/2/6/132695468/e2bd46f5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481510/normal_60478c8d1835a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_5fd3188fb1829.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/lanaladu/what_is_the_network_security_key_for_canon_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14818a4b-449d-4461-9ed5-f39a4810a925/plant_physiology_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/bfa_cooking_guide_alliance.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/canon_digital_photo_professional_software_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/34645338721.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/doxuxikozijufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c70c25e4-6fa9-4891-866f-24334fb80518/al_quran_in_bangla.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_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 5128 bytes
SHA-256: 7e9962482a4d0ddaf1b920fd1501e3cc398f8b8cafee3e6ba775bbf9a3de02c3
font_01_sfnt_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 10976 bytes
SHA-256: 1d3ce4ec5eddb0808bf3303592682177e717829846ae396f6c559654f9056aff

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