Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1640f9fee9b0d7…

MALICIOUS

PDF

74.7 KB Created: 2020-12-19 05:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8b648508a60001726ab880ab7e5acd5c SHA-1: d0a6391a1f9d7fa02368753622c0e1e5e3b71d91 SHA-256: de1640f9fee9b0d73ff2d0c45a6e7c15446d123c702ea9cb31d9cb33dc6a469b
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded links, such as 'https://traffking.ru/123?utm_term=wister+grade+school', suggest an attempt to direct users to potentially harmful websites. The presence of numerous external links indicates a strategy to distribute traffic or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/123?utm_term=wister+grade+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_5f97e3877bf93.pdfIn PDF document text
    • https://kiligazifozu.weebly.com/uploads/1/3/4/5/134506598/8335041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f87a935ac778.pdfIn PDF document text
    • https://josafobuwevaj.weebly.com/uploads/1/3/4/4/134464642/popaxota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530868/normal_5fd9d31907929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376619/normal_5f8f336a7ec03.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/tixedujegibex/cloudformation_s3_bucket_name.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/xegabizuwapubonoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b29ca60e-c72b-4096-82ab-85dd5bc9e855/binog_scan_fallen_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e089f57f-298a-4a7a-be7e-b4d556a4c950/the_importance_of_being_earnest_study_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc77bb32da0933358947c99/t/5fd02a82ab2d482295d52184/1607477890653/zovenukefotumamisofedajav.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/chrome_json_formatter_plugin.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/lurow.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 5216 bytes
SHA-256: 2ffe911fda273b59598a2743b4c684400149015d7c835a5f95cd44be26caeffc
font_01_sfnt_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 10668 bytes
SHA-256: a097ab0c5960627c13c9a53856e45f95e5d29c3bc702fbb8f839fe8b2cfa679a

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