Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a670f146ed4163c…

MALICIOUS

PDF

85.6 KB Created: 2021-03-15 20:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c836adf26accd44558892c05c1fbd444 SHA-1: e9fdd8854744c21fdf2d8462525d426d84588e86 SHA-256: 6a670f146ed4163c36866750448444f4e42bd2522dbcc84f4253fb747f45d885
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier also assigned a very high probability of maliciousness. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=.+jboss.+org+jboss+tools%252F+updates PDF link annotation
    • https://gerunujixode.weebly.com/uploads/1/3/1/6/131606408/kurisir.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/1hcZJih/58934757585.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/9gcaihc/drift_clash_mod_money.pdfIn PDF document text
    • https://dogixosewe.weebly.com/uploads/1/3/4/6/134633635/savigefobodu.pdfIn PDF document text
    • https://sonefuvik.weebly.com/uploads/1/3/4/3/134325549/2846354.pdfIn PDF document text
    • https://mobejameraxoluv.weebly.com/uploads/1/3/5/3/135316129/d9a28f9a655682e.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/vuxora.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/pWG8fgc/78836167988.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/ZjgVBjf/ben_10_coloring_pictures.pdfIn PDF document text
    • https://famereruzune.weebly.com/uploads/1/3/1/6/131637342/6273279.pdfIn PDF document text
    • https://sodukosikel.weebly.com/uploads/1/3/4/5/134598711/2959618.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/06639459-760f-43a5-be14-e1f8fb42a022/casio_fx-115ms_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/20069504718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ee2d8e6-74bd-48fc-8e74-737db0625e3f/10921240267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/614db164-b594-443d-88cc-43941b303876/korabumebiwinir.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/pozupidimegamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2110e2d6-0af4-4ff4-b9c7-5e25482944f9/31372188893.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_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 5316 bytes
SHA-256: 2ea6c9399449208941cd1f7c4c788fb9a63153f2d978f8a47bc712cb6f9be8b7
font_01_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 11600 bytes
SHA-256: 87348777189c7d95960125ad44a58540e5b66023cc43c77553e4b91cdcfded64

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