Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec55d6e2ad39898…

MALICIOUS

PDF

72.8 KB Created: 2021-04-02 00:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4cdcd1fc842590f7b94da7fb658cf92c SHA-1: 2b95e3df329875272da17478ce753b1d3951b4e5 SHA-256: bec55d6e2ad3989840fd73eec73ca75bd120f015ef68b7a0323ada62ab74205c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, appears to contain keywords related to a 'Dewalt miter saw stand instructions', likely a lure to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/strik?utm_term=dewalt+miter+saw+stand+dwx726+instructions PDF link annotation
    • https://woxigixekamut.weebly.com/uploads/1/3/0/7/130739530/d3e0766d43.pdfIn PDF document text
    • https://lukazerud.weebly.com/uploads/1/3/4/3/134343231/bafixujir.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/nafolote.pdfIn PDF document text
    • https://jonaduxito.weebly.com/uploads/1/3/1/3/131384171/de6b7386e80.pdfIn PDF document text
    • https://poxefapujo.weebly.com/uploads/1/3/5/3/135312596/duwatoxira-vabalawel-musaxudinaju.pdfIn PDF document text
    • https://lekudelido.weebly.com/uploads/1/3/1/3/131378953/ketab-bixiwaxomogi-gejimudoritujat.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/mevofiwatudota.pdfIn PDF document text
    • https://rikisefunem.weebly.com/uploads/1/3/5/3/135337995/bevedas-lidemus-safoj-dejugixe.pdfIn PDF document text
    • http://kekijojovif.sportsontheweb.net/boston_map._download.pdfIn PDF document text
    • http://tuxesimufimiti.mypressonline.com/is_there_an_irish_times_today.pdfIn PDF document text
    • https://manoxumumaxu.weebly.com/uploads/1/3/4/4/134472756/4914489.pdfIn PDF document text
    • https://reledizov.weebly.com/uploads/1/3/0/7/130775001/4eceb3b79b048.pdfIn PDF document text
    • https://viwifigejemi.weebly.com/uploads/1/3/0/8/130814408/9901460.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/98877720915.pdfIn PDF document text
    • http://vexoxem.scienceontheweb.net/83860388232.pdfIn PDF document text
    • https://duxepanakotijek.weebly.com/uploads/1/3/4/3/134340233/rovetez.pdfIn PDF document text
    • https://vufumepuzatine.weebly.com/uploads/1/3/5/3/135335191/muzediwesaxiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/civil_engineering_drawing_handbook.pdfIn PDF document text
    • http://pimimozoji.myartsonline.com/zavunewuv.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/31644861236.pdfIn PDF document text
    • http://lerumedinopox.onlinewebshop.net/vapunened.pdfIn PDF document text
    • http://donufuruwitij.atwebpages.com/evaluation_of_broadcast_media.pdfIn PDF document text
    • http://jarepumemaxi.onlinewebshop.net/banking_news_2020.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_off0000ddd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 5612 bytes
SHA-256: 2fee4bd9e524ac78c66677bca737656f63ee6ef838b672f41cd0f2e6c8ed277d
font_01_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 11148 bytes
SHA-256: cbeb6c9ae57525324de87f0b814691ce1a154030b0bce19db8a168162bdc3636