Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd0a5d12d59e94f…

MALICIOUS

PDF

83.9 KB Created: 2021-04-22 13:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c42e55af169a03c65907a89cbaa2d49d SHA-1: 2997bffe040cccb8ef72760d5e15179ce667ac5f SHA-256: abd0a5d12d59e94fb11e074cd8ca3015337470d8e6fdd674105e8b21b7575eef
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The PDF contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of external links points to a likely attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=tone%252Fattitude+words+categorized
    • https://rimekadosa.weebly.com/uploads/1/3/4/4/134467829/279709397fe2.pdf
    • https://cdn-cms.f-static.net/uploads/4414341/normal_606e143487095.pdf
    • https://cdn-cms.f-static.net/uploads/4365560/normal_601f873568d0a.pdf
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/9877006.pdf
    • https://defiduzumuxel.weebly.com/uploads/1/3/2/6/132682342/rukasuvudulir.pdf
    • https://cdn-cms.f-static.net/uploads/4365652/normal_6066439340f73.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_130c8b052ff7438c86e467196293ddd6.pdf?index=true
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_5a7c4e7ce9214113b8a3401e8488fb40.pdf?index=true
    • https://997b2cc2-d96d-4654-b184-8a5d7ad473c0.filesusr.com/ugd/b8d08c_99c4134fa7be4537898bbe6460b36b84.pdf?index=true
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_e26781f44df84df1a015974ff5af72bc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/50d5c824-34f7-4d14-bd46-b014cecd7ce2/kutiwiwev.pdf
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_00e853b1b0a746b8a90c6834f886afef.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7f49d408-fa98-41b6-85bf-76157b7c08a1/pharmacy_technician_certification_math_problems.pdf
    • https://uploads.strikinglycdn.com/files/c0cb33ca-4de9-428a-bf0c-a0134e4b3ef8/montgomery_county_texas_sales_tax_rate_2019.pdf
    • https://uploads.strikinglycdn.com/files/469f75e4-2ada-423e-9f9e-e15d791b0e2e/buzz_lightyear_battery_installation.pdf
    • https://uploads.strikinglycdn.com/files/65f5b2a8-160b-4179-b8ea-c77119c68530/serivokekexubimilesewe.pdf
    • https://uploads.strikinglycdn.com/files/4b51a9a8-af4d-4509-847a-a2f75d0d2064/retapolotuxos.pdf
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_d5ca6def8ed34877ac049edbdbce9dda.pdf?index=true
    • 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_off00010cea.bin
1a29015bc2fb6df1eb84c2b31122734e998945857484fe75278bc4c20f8d5021		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 5200 bytes
font_01_sfnt_off00011ecd.bin
637f80dc92ebd567612d76b407bf716acd5ea0f60381573d93cae9eef73dddb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 10616 bytes

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