Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3739e981857e2e…

MALICIOUS

PDF

78.2 KB Created: 2021-03-17 15:52:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0fd407d276288779dcc5806ecd463ff2 SHA-1: dd5ca805f087bbbca5f933ec2bd1f013e3670567 SHA-256: 0a3739e981857e2e1b1c7e1ac896b053048579c1c60b660cd417f60d907ceb0c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a lure related to an 'Epson workforce' printer. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, suggesting the PDF is designed to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly support its classification as malicious.

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://bologen.ru/strik?utm_term=epson+workforce+wf-3540+wireless+all-in-one+color+inkjet+printer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388063/normal_6031d98519158.pdfIn PDF document text
    • http://creditscorefix.info/486634788554yxxm.pdfIn PDF document text
    • https://tofariviviri.weebly.com/uploads/1/3/4/1/134109347/gafivedepep.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/escuelas_sistemas_y_corrientes_de_la_psicologa_contempornea.pdfIn PDF document text
    • http://bridgecommerce.com/dakenobowukirisovopi5wg95.pdfIn PDF document text
    • https://lepoboniw.weebly.com/uploads/1/3/0/9/130969744/db06cbccc.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/50106980396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408851/normal_601f83d50a892.pdfIn PDF document text
    • http://naturalm.space/7877146063273cbm.pdfIn PDF document text
    • https://tesegedoveveda.weebly.com/uploads/1/3/4/8/134891870/rivipix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389804/normal_5fec9e435c811.pdfIn PDF document text
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/filopeb-pifaxanexoko-tipawoxudusib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_603aeeaaa3e55.pdfIn PDF document text
    • https://wemavejuza.weebly.com/uploads/1/3/4/6/134689468/2135440.pdfIn PDF document text
    • https://bumewotosebixab.weebly.com/uploads/1/3/5/2/135298585/4863224.pdfIn PDF document text
    • http://sodahub.pro/mufipozumisazukawigepojco3te.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tapelu/xinimupiluxalutaba.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/how_to_read_battery_report_windows_7.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 5748 bytes
SHA-256: dece543d18991cd025d05d1e2c6292f8fb9a9333e601b1685676d7fba55a2b40
font_01_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 10772 bytes
SHA-256: 29c3aaec306489a5c57af6493d6be1ceff5fbf381971f3dca5d046d60e025f3f

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