Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d123e3044ad6493…

MALICIOUS

PDF

93.5 KB Created: 2021-05-26 02:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ed9a08f1fa17e21832962331f3fce469 SHA-1: d8969d2ed982a0795014f01292c449a2b033c6e0 SHA-256: 7d123e3044ad6493b0070c486478f4f3a66299b8133b439da8ff6d13a85dc94b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 detection for a link farm and a high-confidence ML classification. It contains numerous external links, with the primary suspicious URL being https://druttle.ru/strik. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to redirect users to potentially malicious sites, likely for phishing or to generate traffic for SEO purposes. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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
  • 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://druttle.ru/strik?utm_term=welsh+terrier+grooming+chart PDF link annotation
    • https://lixezakokigek.weebly.com/uploads/1/3/4/5/134596317/dokajalapikakexotol.pdfIn PDF document text
    • https://denasigetul.weebly.com/uploads/1/3/4/3/134332190/0d23a3280.pdfIn PDF document text
    • https://ruxunomitebapat.weebly.com/uploads/1/3/1/6/131606858/72f364edaf794.pdfIn PDF document text
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/a5c81cce3f.pdfIn PDF document text
    • https://nuxinipimop.weebly.com/uploads/1/3/2/6/132682773/7c93a84e.pdfIn PDF document text
    • https://sewolisexuvafu.weebly.com/uploads/1/3/2/8/132815731/4743660.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3568c740-e3b8-407b-bdce-f8ff251df57e/how_to_make_a_lap_steel_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/debf19f2-beb1-4e0e-bb43-56892345d360/an_introduction_to_r_for_spatial_analysis_and_mapping_chris_brunsdon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a4ecaac-b9e9-48e5-a64a-44904e532a95/accu_chek_instant_test_strips_how_to_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/708c3085-8e34-4051-90d9-5ead59a089cf/86414991971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed51e3df-77e4-445d-8685-6a7ec2b19f65/89697123479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92da8a8f-2f22-4b1b-b35e-c74524d47d95/28430636838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95f4a62-d495-4593-8c7d-ce15d665fd4e/94751203175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b42201b-38cc-45d5-9da3-c8777b24c0c2/lukapev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff39d691-9195-4dac-944d-5ef822b474cc/trx_military_fitness_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71872945-8985-41d0-b146-30a8d046b307/project_management_professional_certification_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48a933c8-448d-48bb-81b7-2210d446801e/21834902544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c20658ca-edfa-4d34-b973-36c3375840b9/zusebajejodoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0989627-7a7e-4333-a966-8c8a8ffb2f7b/xufipogade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcd05ee1-4750-41b8-8da9-af6b05642bfb/62976414824.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_off0001314e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314E 5228 bytes
SHA-256: 3a5f74081ee6d1c0d3d0bf708383546afb27eee0e24bfb00513996d313133def
font_01_sfnt_off000142f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F5 10768 bytes
SHA-256: 6323939922e4ea6041cf7bddba21a28768ca9c91af40c4d5c42e0eacdb2b97e3

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