Malicious PDF — malware analysis report

Static analysis result for SHA-256 b648b2f7d3ab3ce7…

MALICIOUS

PDF

77.1 KB Created: 2021-04-03 19:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5979444bfe3f073f6e2a476348bbd620 SHA-1: 85c8639ba7077abe7e25e9af0225dae387c3b326 SHA-256: b648b2f7d3ab3ce741316219b15210290030f6de6ecbcc34ec2a58581b1fc40e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing attempt. The primary URL, https://mezovuduw.ru/award?keyword=tratamento+do+cancer+de+pulm%25C3%25A3o+pdf, is suspicious and likely leads to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://mezovuduw.ru/award?keyword=tratamento+do+cancer+de+pulm%25C3%25A3o+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478688/normal_6042cce574019.pdfIn PDF document text
    • https://jenazikefu.weebly.com/uploads/1/3/4/0/134017187/satobovoguge-pisofoz-simubepasis-wagubefovetuvu.pdfIn PDF document text
    • https://sevujixosatanin.weebly.com/uploads/1/3/5/3/135316334/toxagoluwajodipud.pdfIn PDF document text
    • https://xazonidunigi.weebly.com/uploads/1/3/4/5/134590253/9628832.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/1f12abe7cdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403131/normal_5ff4d8304985d.pdfIn PDF document text
    • https://nulesurusisozi.weebly.com/uploads/1/3/4/7/134744420/gulejisagupal-pepuvidava-vawixiw-xakudureka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386084/normal_6033eed3b92a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_6062a0a334113.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369315/normal_600019623fede.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/defujo/10th_class_science_ncert_book_question_answer.pdfIn PDF document text
    • http://mafizili.epizy.com/pasoj.pdfIn PDF document text
    • http://gezojetisab.epizy.com/java_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/breve_historia_de_los_estados_unidos_philip_jenkins.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/lijaz.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/polyester_sheets_vs_cotton.pdfIn PDF document text
    • http://lokanubuxona.rf.gd/ps4_emulator_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/mexican_day_of_the_dead_worksheet.pdfIn PDF document text
    • http://nubijusumodas.rf.gd/19962555063.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_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 5388 bytes
SHA-256: bb6f31e0034a63abf9d43b3ce7a61a8c7c44f13515626def876bc423266600cb
font_01_sfnt_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 12204 bytes
SHA-256: 846c701c058743437f75b477cf0051d8b1b2f03f6a0b53cd364ca9056ed9edad

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