Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8c789141385ae9…

MALICIOUS

PDF

78.7 KB Created: 2021-02-24 06:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: f6fc87f42b77ec46efdd87dc5ccf550d SHA-1: e159a4a4ebfc5e55d181bcb093d9b1e8ec2f5e4b SHA-256: fa8c789141385ae9a931aaebe69219dc6c732a947cd34949401a3e5d71f40602
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. The primary malicious URL identified is 'https://baarspo.ru/strik?utm_term=hp+8600+printer+toner', which is likely used to deliver a second-stage payload or redirect to a phishing page.

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 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://baarspo.ru/strik?utm_term=hp+8600+printer+toner PDF link annotation
    • https://sewatebemadog.weebly.com/uploads/1/3/1/1/131164437/2311918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_5fd241669008b.pdfIn PDF document text
    • http://idealica-co.site/13489292623q9s12.pdfIn PDF document text
    • https://radalumimobexod.weebly.com/uploads/1/3/5/9/135957078/pikitojufeju-lukobuj-gerinom-sufedogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418566/normal_6016e5d663c45.pdfIn PDF document text
    • http://fringigejy.site/570585969207r3w2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jizuwugi.rf.gd/niwejobapubuluzokaxuji.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/broil_king_baron_520_manual.pdfIn PDF document text
    • http://wukefomirufiza.rf.gd/dorodibinorukuferolesexuk.pdfIn PDF document text
    • http://pimifemegizak.epizy.com/57435922826.pdfIn PDF document text
    • http://napidolir.rf.gd/xemanusarazugagar.pdfIn PDF document text
    • http://zibemusisuvimal.rf.gd/bestie_birthday_song.pdfIn PDF document text
    • http://fefezaw.rf.gd/dashboards_in_power_bi_report_server.pdfIn PDF document text
    • http://namavorudil.epizy.com/salipakipa.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/brute_force_app.pdfIn PDF document text
    • http://lokimutopilar.epizy.com/vodimunefag.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_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 4844 bytes
SHA-256: b15ae7fa09c74e3ae3afb3a8d88317d7c818311449a2336cd785527e420d3526
font_01_sfnt_off00010a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A49 10632 bytes
SHA-256: bc0b38feb5c60f10a259112e05080509e4df54d00f1834a4922df0b58d52336c

Open this report in the interactive analyzer, or submit your own file for analysis.