Malicious PDF — malware analysis report

Static analysis result for SHA-256 66095fca1d80a93a…

MALICIOUS

PDF

70.2 KB Created: 2020-11-10 07:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 62c237ccf1a1c180c87574573fab6894 SHA-1: 1a4be952748dd3326d1aab5810a8a4a8670ac8b0 SHA-256: 66095fca1d80a93ae0714b2bbfca17992cb1d6d669f0ad368c7e6cb695be959f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?keyword=epidemic+sound+sweden PDF link annotation
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/xinimafumuvuk.pdfIn PDF document text
    • https://jidugurulepapol.weebly.com/uploads/1/3/4/3/134310086/dfb98.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/fff526b9-bda0-4669-8c1d-d238e08c58eb/35859215601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc63260-7f49-47e2-8a2a-6bcedbd32ec8/vomazuzorojalolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b412af-22ef-4394-9de6-38b9b34ff4c0/maus_volume_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba1fc5e-279f-44c9-9f27-e7eda385f9c8/zombie_assault_2_hacked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f1110c4-f9b1-4a95-afc4-b95a7ea4018d/sugamanilixini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f796b28d-15ef-452e-a313-f6d01e6f3d00/4184563322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dbb6dcf-7528-45e2-835f-42985e191e65/56288254579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1776040-9b53-468b-8fb8-bb9f05600dd5/41005013615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd069755-c296-4703-986b-5eee86738e94/xanonimapumesuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbcb8e66-4c2c-406d-8129-76abab672b78/73560472589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae0c88d-4039-43c2-b4ec-5917d3cbb7ed/7028076355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25dba481-d0c4-4155-ae4f-c92038900084/pepunidetuvoxuveginut.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_off0000d63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63F 4932 bytes
SHA-256: f23f8815487f9bafd89ca96eb47385f409fb80f04c2db3ebafbd89784f36d751
font_01_sfnt_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 11036 bytes
SHA-256: f45ed5ac0f1d8ebd26b821a0bffa78d104c1c4329808930a6d300c2f0f79afa2

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