Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b91b6cde65ef0f…

MALICIOUS

PDF

75.7 KB Created: 2021-02-27 07:57:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: e54bd231a64839027d6090e89d06c72f SHA-1: 6ddf3272f9ee7e716d0994dd60dcb2fe16457111 SHA-256: 44b91b6cde65ef0fead219df187f607cd2e96e3b9b54cffdcbcfb9f3290d4869
186 Risk Score

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 high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The embedded URL `https://kuzutuzo.ru/aws?utm_term=jandy+aquapure+service+code+123` is a primary indicator of the malicious infrastructure used.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/aws?utm_term=jandy+aquapure+service+code+123 PDF link annotation
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/8784064.pdfIn PDF document text
    • https://rubitolagaju.weebly.com/uploads/1/3/5/3/135330326/6007398.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/xadilafa.pdfIn PDF document text
    • http://unityfree.xyz/create_alert_box_in_androidpsda1.pdfIn PDF document text
    • https://luwojasog.weebly.com/uploads/1/3/1/3/131380471/pivenedifutuwa-getisilesixo-vigam.pdfIn PDF document text
    • https://vamepaxokuwi.weebly.com/uploads/1/3/5/9/135959455/rifisekib.pdfIn PDF document text
    • http://qrettalq.online/sql_database_management036t8.pdfIn PDF document text
    • http://help-violation.com/41979777782ki9ey.pdfIn PDF document text
    • https://pazuvokase.weebly.com/uploads/1/3/4/6/134615635/giginozotanuxa.pdfIn PDF document text
    • http://modernstyle.pro/39840239514srf6j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nanesipub.rf.gd/21254837480.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/public_finance_and_taxation.pdfIn PDF document text
    • http://konevimojo.epizy.com/ielts_speaking_tests_practice_filetype.pdfIn PDF document text
    • http://pixutixiziv.epizy.com/mibik.pdfIn PDF document text
    • http://bevowamudad.epizy.com/ppt_template_for_interview_presentation.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_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 5660 bytes
SHA-256: f7d3c1e74fe48f1c82193a7aa341c0bd709f80066e3119eb16d93fb1d1c6f8ec
font_01_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 11756 bytes
SHA-256: d43fca91fdb3768badf859a7913fe9684f85e9e8f9dcdbaf4cc5b0ca99d2814b

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