Malicious PDF — malware analysis report

Static analysis result for SHA-256 75405d0a5e945487…

MALICIOUS

PDF

78.6 KB Created: 2021-01-03 16:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9a38f46074aa08c9e3bff01d55be365a SHA-1: 55e965ed6439ac5c700d1c4d6051550e3dc6bf25 SHA-256: 75405d0a5e945487658f7b5a13a0de517744a48f2e53b877bdec451262d66859
164 Risk Score

Malware Insights

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

The PDF contains a lure related to downloading a game ('Alien zombie shooter 2 download') and embeds numerous external links, many of which point to other PDFs. One heuristic specifically identifies this as a 'PDF SEO LINK FARM' designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffi.ru/wb?keyword=alien%20zombie%20shooter%202%20download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495558/normal_5fee9af46e83d.pdfIn PDF document text
    • https://nanarazoru.weebly.com/uploads/1/3/4/8/134859944/2234169.pdfIn PDF document text
    • https://cdn.sqhk.co/tesinogopano/gjChaid/swat_movie_cast_name.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/benubapopikaj/aurora_central_catholic_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/ateneo_shs_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c773948c-2cc2-4299-bfaf-d79dba3e0057/victoria_beckham_short_hair_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/9190684470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1089735-7549-4566-8fee-b567e51ae431/26981670992.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/39364002642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291ca674-7dd4-4a15-bc46-3cfcfccdc8ca/juforuwowiwazezuge.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/system_administrator_job_description.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 5468 bytes
SHA-256: 8780d3fc4ca113ae27695b617ca75306a37ba9ba9f83a115223d40fabd55853b
font_01_sfnt_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 11196 bytes
SHA-256: d6dc79b343cc21b2f3eaf4f9c3db6053f5aae121aed2b1149dbcd01c57056a48
font_02_sfnt_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 17416 bytes
SHA-256: ec4d38b70591ee32b12d5e2ca42566d09bf432f18533de061a4b08a92298efdc

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