Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfbf38ef076f8a9…

MALICIOUS

PDF

67.6 KB Created: 2021-01-14 20:04:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bd74868bd729bcd8a8aa633a41b59566 SHA-1: 54028438643d3f282a35aea472c267cdb8f81862 SHA-256: 9bfbf38ef076f8a93d4cfaac49a9261db95bf051295f4061fb057f071dad1027
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's a phishing or redirector. It contains a large number of links, many hosted on disposable domains, designed to redirect users to malicious infrastructure. The embedded URLs and the PDF structure suggest an attempt to disguise malicious content as legitimate information, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?utm_term=nokia+lumia+520+update+windows+10 In PDF document text
    • https://cdn.sqhk.co/worenora/4ZXGeee/daban.pdfIn PDF document text
    • https://jopovasido.weebly.com/uploads/1/3/4/6/134619877/keduzawi_guwegap_sojafilogu.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/438809.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/8c260.pdfIn PDF document text
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/jalobopefiweza-rilikubej-zeritok-xaxijomoxotabej.pdfIn PDF document text
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/dc9552d05e052a.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/Kjhhgji/ludetija.pdfIn PDF document text
    • https://xilamexazoleguj.weebly.com/uploads/1/3/2/6/132695560/doforakanume.pdfIn PDF document text
    • https://site-1168018.mozfiles.com/files/1168018/mgvcl_electricity_bill_check_gujarat.pdfIn PDF document text
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/zuboduzaxeju.pdfIn PDF document text
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/regezex-zedowef-nuwimikadori.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/jusagi/46101921341.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_off0000c9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B1 5584 bytes
SHA-256: 0a9d474769ce2800fbbd0b16ba409ada190e50c80be01da1feb5b38033934c45
font_01_sfnt_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 10812 bytes
SHA-256: 14594cdff6f06fefcc14d8ae83e51427195ced3bed770f3549d39370e1d1ce7c

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