Malicious PDF — malware analysis report

Static analysis result for SHA-256 033b229169ae5603…

MALICIOUS

PDF

83.3 KB Created: 2021-05-23 05:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0669fec4566668abf70442b661000e36 SHA-1: 65da589cef35e40ed7430f689da19ca26de3ab8b SHA-256: 033b229169ae5603819a8d0f7659a331d26b4eb7ee76bfe594e4f1e6d5940556
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these linked documents. No scripts were extracted, and the document body is heavily obfuscated.

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://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/zawerafidufetedoduw.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_6057e8bd5dcf1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370068/normal_5fc8b33de6158.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369327/normal_5fdf2c5414ed4.pdfIn PDF document text
    • https://fexalikinuzumow.weebly.com/uploads/1/3/5/3/135324316/418b54.pdfIn PDF document text
    • https://lebugaboforov.weebly.com/uploads/1/3/5/9/135976333/dujemutera.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/gebekeniwugen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_606d509ed26ea.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/3292293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_60379bcd8e230.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Xr6F2PkPTcg/wb?keyword=how%20is%20sound%20used%20in%20everyday%20lifePDF link annotation
    • https://s3.amazonaws.com/vonusirukete/makolurevuvutifipafis.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/32875437910.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/kenmore_front_load_washer_not_starting.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/carboxylic_acids_naming_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/4554496274.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/medical_certificate_form_for_school_admission.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_off00010862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 5116 bytes
SHA-256: 703817553cc0fed91e5a0f881dffdd44bfbc0fc4603abe217ce027f9c05d303a
font_01_sfnt_off000119f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 11232 bytes
SHA-256: 5a1bd9fc57597f13d6a19b123f5dff02eadae60a83de2a9cc77905e728ad2f70

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