Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b4573e2101e551…

MALICIOUS

PDF

70.0 KB Created: 2021-01-06 15:04:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3ac05bea90821ff2bdaee8105e438163 SHA-1: 736d2a5127ba3f6b171711db52efad4ef4f0d02b SHA-256: 86b4573e2101e5510e4f4a50f3b706f3714423322f2b210b644f7fe2dc179f29
214 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with a plausible lure related to 'piano sheet music'. This indicates a phishing or malware distribution attempt. The heuristic firings confirm the presence of malicious redirector links and a link farm, strongly suggesting malicious intent. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://cctraff.ru/aws?utm_term=ruby+twenty+one+pilots+piano+sheet+music In PDF document text
    • https://static.s123-cdn-static.com/uploads/4389824/normal_5fdfc333a9561.pdfIn PDF document text
    • https://nomalepizu.weebly.com/uploads/1/3/1/3/131398516/nuravukod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412403/normal_5f9b229b3135d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5f9740887b6ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418383/normal_5fce63c1e34af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424692/normal_5fe2b7c7b5e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_5fb98b2588b68.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/NNBRjcE/lara_croft_go_walkthrough_cave_of_fire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_5f9ec4c3c8e5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5f8939e633b71.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/c5ijPsH/red_rose_spa_germantown_pike.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/tibitexil/us_immigration_test_answers.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_off0000d551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD551 5420 bytes
SHA-256: 340e45dc60c9da3517a646f7cd24b40634e8f8a83f652ca7cbebc4db3af851a7
font_01_sfnt_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 10444 bytes
SHA-256: 1ddf36423902ae46a67539ac63b8a2a597abfcd89a92fbc142d4e1a550043ab9

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