Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3b54ec55d9f7fe…

MALICIOUS

PDF

73.3 KB Created: 2021-03-12 19:26:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8f6b603fc5311b9eaf4cf23c0e6af15 SHA-1: 11a31fe7f6105701be3bb813a6ce917ecf7d7633 SHA-256: 2a3b54ec55d9f7fe5eb63961e075f467fce3ad58b3bbd099d6cbc8a95f0187a5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/award?keyword=5+characteristics+of+a+good+research+problem+pdf
    • https://static.s123-cdn-static.com/uploads/4460447/normal_6003b85d1b580.pdf
    • https://cdn-cms.f-static.net/uploads/4443799/normal_5fe649f2c3ba2.pdf
    • https://cdn-cms.f-static.net/uploads/4385020/normal_601cdaa102275.pdf
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/nidoxolonapow_wejagafuxogene.pdf
    • https://cdn-cms.f-static.net/uploads/4411229/normal_5fe6296b1b0dc.pdf
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/6371907.pdf
    • https://static.s123-cdn-static.com/uploads/4501214/normal_5ffd70cd021c5.pdf
    • https://cdn-cms.f-static.net/uploads/4418987/normal_603cfad54c45d.pdf
    • https://cdn-cms.f-static.net/uploads/4411229/normal_6049039ee7cb4.pdf
    • https://cdn-cms.f-static.net/uploads/4368475/normal_603f7e80d3613.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bfb420de-034c-45e0-bf23-49a7429acd7d/temukekikasisitogovesetov.pdf
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_4fd19cab74e74ab28f1a35711fd39bd1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c1ede41e-1bf5-4e71-a2e0-bef7a75a8a39/smart_board_price_in_india_amazon.pdf
    • https://uploads.strikinglycdn.com/files/7ef91a24-9281-44bf-ba6a-0e3ea322740e/the_sun_in_the_morning_time.pdf
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_8b4c4fd27f0a4c0781ea33f519baec37.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_off0000e167.bin
062f4d310d91fb9e3b4929aad9846f477b17887a85b8a89786bafbc753bde05e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 5740 bytes
font_01_sfnt_off0000f4c3.bin
888bbe0d86a58de19e4026e1b27d8c637312a43e705fb8cd9d062c4e172a832f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 10388 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.