Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4e38b09a0c6e24…

MALICIOUS

PDF

81.3 KB Created: 2021-01-06 04:10:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f5ef87e5f08262435ad4383e2c85327f SHA-1: 743b7de4d8a78594967b1b30b1f7fa2014d88344 SHA-256: fe4e38b09a0c6e24d4c1775a8981ef3fc54c7a6880a6bd6bb53730a38ef6e205
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the presence of numerous malicious links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://traffmen.ru/123?utm_term=dokkan+battle+jp+missions+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424982/normal_5fd9a4002f2f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_5f952313b3453.pdfIn PDF document text
    • https://cdn.sqhk.co/domuduxuro/4hbdhbj/97739886026.pdfIn PDF document text
    • https://gibeduxobiwutu.weebly.com/uploads/1/3/4/7/134752611/4a54763a8.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/HgcV9hb/jorur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383160/normal_5fce459e0f210.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/dggMjjq/51606695670.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/jjil1hi/zadasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_5fad146c39404.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/wetevali/calibre_epub_reader_free.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_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 5424 bytes
SHA-256: c8ce5c3883532e9199aca97c878c1ed010637014456f09925297276bfd0e7074
font_01_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 11328 bytes
SHA-256: c87a85e00cd6bbb7d9f5d11219bf07edd175e6bdb7948a151730e80377797318
font_02_sfnt_off000121f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 16160 bytes
SHA-256: b91ebbfc40a94f10b2fcfc4d08542e4cd4fc38dcff43bcfefe5d572695fcce17

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