Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ae4d5b793e7992…

MALICIOUS

PDF

80.4 KB Created: 2021-02-23 20:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 836ae1efb955394acc10b92d9376662f SHA-1: e1a733163e11b38871e37fdcaa7e6dde26c9a1f7 SHA-256: 53ae4d5b793e79922efdc0e0a023c5bf538171c5f17bc573bbf3f60e8d61e6af
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to other PDF files hosted on various disposable domains. This behavior is characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

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://jottigo.ru/strik?utm_term=does+dish+network+get+newsmax PDF link annotation
    • http://omshop.space/548078167503p0qf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426815/normal_5fc5a7fab78dd.pdfIn PDF document text
    • http://okrasote.info/60628721109vsk0.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/harry_potter_book_3_plot5sjyj.pdfIn PDF document text
    • https://gupekuvexo.weebly.com/uploads/1/3/4/6/134610658/kegemedujanage.pdfIn PDF document text
    • https://garevanixuxud.weebly.com/uploads/1/3/4/3/134371644/9144183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_6013be440e871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450338/normal_602c81100754f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466166/normal_5feaec27d8c2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380076/normal_5ff57844950ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_6034bfc583793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_6015b6719ab36.pdfIn PDF document text
    • http://kyhni.site/problem_and_solution_essay8ypoa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403533/normal_60292f7b5dcde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449789/normal_602067c6a0a71.pdfIn PDF document text
    • https://rebopugosoge.weebly.com/uploads/1/3/5/3/135346619/1b9c68191d6.pdfIn PDF document text
    • https://lumigoxodavi.weebly.com/uploads/1/3/1/6/131606620/9699488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_6026e5b5571f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 5432 bytes
SHA-256: 9240729dae92d4396bc770155cf6ad5afab3d9b7528ae949c41997b492be5e63
font_01_sfnt_off00010d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9A 11544 bytes
SHA-256: f2c691bd1ffaba9253e8f6a28f56de9590fa965f32ccfd3aba5d6ac1eda9e444

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