Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7377739ee3bb6c…

MALICIOUS

PDF

76.9 KB Created: 2021-03-22 12:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 797bf333d0d117ea49aea368ffc58702 SHA-1: b1879c7c875bcca30b51fd4b71bc0146227bb8e4 SHA-256: ce7377739ee3bb6c0f1b791af136ab96859300218dda6736f9197c867e2fdd68
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary focus on a URL associated with a keyword search, suggesting a phishing or SEO-based lure. Heuristics indicate a link farm and ClamAV detection confirms it as a phishing trojan. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=capacity+yard+truck+service+manual
    • https://cdn-cms.f-static.net/uploads/4483855/normal_6026081d1c59c.pdf
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/d2ef39947.pdf
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/7b5b66ee78.pdf
    • https://static.s123-cdn-static.com/uploads/4368760/normal_5ff45e3d93ed6.pdf
    • https://cdn-cms.f-static.net/uploads/4459463/normal_6044f64e187c0.pdf
    • https://gareketekefebon.weebly.com/uploads/1/3/4/6/134695024/2405417.pdf
    • https://static.s123-cdn-static.com/uploads/4379362/normal_5fc5955e50b26.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7da1241f-029d-4fb7-b7cd-dd8d9f21e03b/65386930.pdf
    • https://uploads.strikinglycdn.com/files/d5267892-2a5a-472c-9219-8ac3aa874dd9/vebodofopepuba.pdf
    • https://s3.amazonaws.com/wefadep/chemical_properties_of_water.pdf
    • https://uploads.strikinglycdn.com/files/bef66652-dd48-498a-8a86-d476346131d4/popivefebeko.pdf
    • https://uploads.strikinglycdn.com/files/7548de55-755d-4841-83e5-7f4461701fbe/7804630262.pdf
    • https://s3.amazonaws.com/pasutiz/towifusunamifudos.pdf
    • https://s3.amazonaws.com/vovabagubajegeb/copper_roofing_sheets_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/3d2d560a-fafb-40bc-9b28-5ba17b06b297/cuisinart_convection_bread_maker_sourdough_recipe.pdf
    • https://s3.amazonaws.com/wexoteluwag/33659849983.pdf
    • https://s3.amazonaws.com/mamukawaxatali/converting_metric_units_worksheet_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/88b872aa-8814-4d92-bee9-1e1960abb434/5862269013.pdf
    • https://uploads.strikinglycdn.com/files/bf48c718-9128-4c1e-b495-89bc14337f39/36944422502.pdf
    • https://uploads.strikinglycdn.com/files/f6f28238-9cbd-4161-a634-9cf9da0e187d/17190195383.pdf
    • https://uploads.strikinglycdn.com/files/af19f77e-f459-4668-874d-738d21a26a0e/58406841006.pdf
    • https://uploads.strikinglycdn.com/files/06d3521f-16d1-43ef-9156-c8639ac502cf/63881652950.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe9.bin
74d84548594b179baa78fbb868ee41970a2b5353d5bcdf0ebc1804f94f2ec1b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 5352 bytes
font_01_sfnt_off00010211.bin
1a65b5edda740d29caf16313023186ee458bfa770b92ce2f5f6ce6da51ebeba9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 10620 bytes