Malicious PDF — malware analysis report

Static analysis result for SHA-256 cface2c3b06be3e4…

MALICIOUS

PDF

114.4 KB Created: 2021-03-17 16:30:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5ad4de655fcca29b3a8d47aa32c69e62 SHA-1: ed09a6dbdc1788ec43a2bf00a12710b6937b50fa SHA-256: cface2c3b06be3e4dc7ceb49a19d1afda52c26e1427e785cc762a268aa3dc3bb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/award?keyword=agenda+2020+pdf+polski PDF link annotation
    • http://lakabusomasa.22web.org/harbor_breeze_remote_manual.pdfIn PDF document text
    • http://lupepujalin.iblogger.org/linanekezugolopuseg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_63f646dd4bb74ebf90c72a49dec243f9.pdf?index=trueIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_0623c7137e7f465da2e9374c57d4947b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb0c6ab-54f9-441c-97b2-138305c1eeed/55892595965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e54f9d-cd02-4dc3-9fe5-0d740e31e923/5545664876.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/wadikezisegawanoworagulex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/692a4655-cef7-4ca1-99c0-67f4e822c8dc/7829729255.pdfIn PDF document text
    • http://vogumogut.epizy.com/criteria_for_evaluating_sources.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1792235-35c6-417a-8813-1546f4f1f570/10591171299.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/97893335760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb0dbab-244e-43f3-ab3d-88ee8314208e/what_should_i_study_for_my_permit_test.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/ccie_wireless_3._1.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_bb2656feb6a845009410f09bd60f9e9c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4443dc9-13fe-435d-b344-7a28a86fc4ca/72321332859.pdfIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_ee88583674854a9e90c1e96563328dbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f920cd6-e141-4541-997d-d8be8f6d5424/stock_market_close_today_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e75d3fc-b28e-4274-b05d-7d70624aee9e/34527242710.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/rifobafuvir.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_off00018021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18021 5440 bytes
SHA-256: 807134e2592e13231ee490fc5fd670a304608faed1f11d988326906c7efb3f96
font_01_sfnt_off000192c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192C9 12232 bytes
SHA-256: 6d7df0df17102040ad18d357d5bd54529cb7342af05e83dd8075eaa444cce8be