Malicious PDF — malware analysis report

Static analysis result for SHA-256 d646f04065aa0d88…

MALICIOUS

PDF

74.5 KB Created: 2021-06-10 05:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4748e72fbb3ac53f6dc80461f85b82a7 SHA-1: da60da6de75788400d675af23c1a74ee180f89cb SHA-256: d646f04065aa0d8859d5dc5de19268988393297e9b626e8cb4c42f5b4074775d
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a significant number of external links, suggesting a link farm or phishing attempt. The presence of a download-related heuristic further supports the idea that the document is designed to trick users into downloading further content. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/pbw?utm_term=bus+simulator+pc+windows+7
    • https://cdn-cms.f-static.net/uploads/4468819/normal_5fd634fd1ecb4.pdf
    • https://static.s123-cdn-static.com/uploads/4494440/normal_60097b1a7371b.pdf
    • https://cdn-cms.f-static.net/uploads/4474722/normal_601402a758d59.pdf
    • https://cdn-cms.f-static.net/uploads/4384154/normal_6068ba83d88f2.pdf
    • https://static.s123-cdn-static-d.com/uploads/4450003/normal_60b4fc809aa21.pdf
    • https://cdn-cms.f-static.net/uploads/4454043/normal_6009e4f8c07d7.pdf
    • https://cdn-cms.f-static.net/uploads/4457312/normal_60be8bf08a864.pdf
    • https://tokemata.weebly.com/uploads/1/3/6/0/136081978/6993257.pdf
    • https://static.s123-cdn-static-d.com/uploads/4423757/normal_60b21c493e3a5.pdf
    • https://cdn-cms.f-static.net/uploads/4471083/normal_6009ca57838d0.pdf
    • https://cdn-cms.f-static.net/uploads/4448096/normal_5fd0ada817214.pdf
    • https://cdn-cms.f-static.net/uploads/4414688/normal_5fd2398d5826a.pdf
    • https://cdn-cms.f-static.net/uploads/4486035/normal_6066b47e361ca.pdf
    • https://cdn-cms.f-static.net/uploads/4476140/normal_6010e8e6d9316.pdf
    • https://cdn-cms.f-static.net/uploads/4475989/normal_6055a49ece601.pdf
    • https://cdn-cms.f-static.net/uploads/4373527/normal_606b223bdaaf8.pdf
    • https://static.s123-cdn-static.com/uploads/4464865/normal_5ff0a3f3bb57a.pdf
    • https://static.s123-cdn-static.com/uploads/4402960/normal_5ffb6eb0798e2.pdf
    • https://zunolerafoxate.weebly.com/uploads/1/3/4/8/134871884/37b4fb54f3a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/34b2b5eb-bb12-4b3e-b6c0-abad279c8cda/zozozupobowaxipagap.pdf
    • https://uploads.strikinglycdn.com/files/815f8013-708c-41bf-ba2a-e0b6d5a9f3a3/planeaciones_de_ingls_secundaria_gratis_para_descargar.pdf
    • https://uploads.strikinglycdn.com/files/6799ea26-5826-4be5-93b5-92193cefef52/84847514637.pdf
    • https://uploads.strikinglycdn.com/files/f7ace7d8-6726-48e0-be6e-f97ec081460e/refamumubodumepemeninafan.pdf
    • https://uploads.strikinglycdn.com/files/ead40947-b2de-40bc-bd70-7126cc026419/rerizinitilegezajulasu.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_off0000e5e9.bin
3673dd34d06d3847764e3ce1632517a395afa9544481de0429856f497c5aeaa8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 5440 bytes
font_01_sfnt_off0000f864.bin
27bac8dde2ecd8dc81b702b4944e05c3c173c57149899f33be85063b447399cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 10696 bytes