Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18f7f52c8afaf2a…

MALICIOUS

PDF

68.2 KB Created: 2021-02-21 21:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 35c329589168ed8fe6be77bfb171b03a SHA-1: 52fd927fef7f1a5f1d69fc3f7a7e6b0e612c74e9 SHA-256: d18f7f52c8afaf2a9c34f6f0a89835a9f6d600b9e1bdb66ea1f33303b023f419
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various PDF documents and potentially malicious URLs. The primary URL, https://maypoin.ru/strik?utm_term=simcity+4+deluxe+activation+code, suggests a lure related to software activation codes. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

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://maypoin.ru/strik?utm_term=simcity+4+deluxe+activation+code PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409394/normal_601db33c2fe6f.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/nejiribesireb.pdfIn PDF document text
    • http://xinegibifupa.iblogger.org/27938769967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452862/normal_5fcbd0af3a260.pdfIn PDF document text
    • http://youla-24.cc/zuzekijirazojuss9g.pdfIn PDF document text
    • https://fizokufewof.weebly.com/uploads/1/3/4/0/134096090/b200a.pdfIn PDF document text
    • https://kagejiwuj.weebly.com/uploads/1/3/4/0/134095923/wimiwimojezexejo.pdfIn PDF document text
    • https://xudekumuf.weebly.com/uploads/1/3/2/6/132681038/wekinilurivewujat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_6012c09b8aeb7.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/pulavokaxe/planet_fitness_starting_fee.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/smartsheet_project_dashboard_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/82749892890.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/company_store_sheets_twin.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/unity_android_sdk_build_tools_version.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_off0000c385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC385 2900 bytes
SHA-256: 68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837
font_01_sfnt_off0000cdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC8 5232 bytes
SHA-256: 4a890dcc95c87a1534bef5c2d41e3fd4d686d22dfca505619626a42798a98ec6
font_02_sfnt_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 10528 bytes
SHA-256: e8d56ae093c18fdb41353208a8386ccf64c162bfe76a668c4e99954a9df2ae84

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