Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3aa0ec547086dc…

MALICIOUS

PDF

77.8 KB Created: 2021-02-12 08:07:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cd9414947bd21079e70d43e3be8503ae SHA-1: 4564883c156f643de65e170d8205e258477e96a2 SHA-256: ea3aa0ec547086dcf54cd688f1a929cbfc3c90840687f4930cdf40f05390adab
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one specifically identified as a malicious redirector. The document body, though truncated and obfuscated, suggests a lure related to a 'certificate of good conduct florida'. The presence of multiple SEO-optimized PDF links indicates a link farm strategy, likely for distributing further malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://yafferge.ru/123?utm_term=certificate+of+good+conduct+florida In PDF document text
    • https://cdn.sqhk.co/mikedeto/ehd8KyZ/pvp_iv_explained.pdfIn PDF document text
    • https://runogobikekeg.weebly.com/uploads/1/3/5/3/135350887/guwovegewobej.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/idjbgiG/tasty_words_level_11_answers.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/6271306.pdfIn PDF document text
    • https://cdn.sqhk.co/wedifedaguju/hzgeLgi/colors_that_go_with_red_and_white_clothes.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/cylhcqe/296642047.pdfIn PDF document text
    • https://bitipobigexu.weebly.com/uploads/1/3/5/3/135399459/bc133.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/hcjcIfi/infected_wound_synonyms.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/hhrLiKQ/29353058906.pdfIn PDF document text
    • https://wekimede.weebly.com/uploads/1/3/4/8/134862148/9435549.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nonogopikizezed.rf.gd/36048967578.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/basal_ganglia_infarction_case_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/cisco_nexus_2000_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/business_report_title_page_example.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E6 4916 bytes
SHA-256: 68f3c8f58e4e84150a2aedda9dd03cd9beae3968344bf516fb736d536d633af4
font_01_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 11256 bytes
SHA-256: b959216328307bf2ce8f58840231fe91cbf0a1ebe30b695ccdafeb89b88c6103
font_02_sfnt_off00011c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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